Solarscope SF70DS incoming

Use this section to discuss "standard" Baader/Coronado/ Lunt SolarView/ Daystar, etc… filters, cameras and scopes. No mods, just questions/ answers and reviews.
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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

DeepSolar64 wrote: Sat Jun 06, 2020 5:17 am My SMII90, actually a 102 in SS works wonderfully on proms and limb detail but so far is only so-so on disc detail. It's really bright. But the resolution it gives on the limb is outstanding. In DS it gives decent views but seems to be harder to tune than the 60. I can't look through the eyepiece at the same time I am twiddling the tuner. Arm is not long enough!

I am surprised that the Solarscope would give a more even tuned field than the Lunt scopes unless you are talking about one of their tilt-tuned models. Their pressure tuners by what I have read tune more evenly giving less of a sweet spot. Coronado scopes are tilt-tuned and have pronounced sweet-spots. At least mine does. The SMII 60 seems more so than the SMII 90.

The fact you can use high magnification says a lot too. On my Coronado SMII60, especially in DS I have to stick with lower powers. Detail just disappears with high magnification. I use the 25mm Cemax and 19mm Lunt eyepieces the most giving 16 and 21.5 power. I rarely ever use anything over 50x. The SMII 90 is a different animal. 100x and over is possible with good seeing.
Both my pressure tuned Lunts had sweet spots. You have to ‘clock’ the double stack filter to alter the sweet spot and reveal detail. Perhaps they are more even than the tilt models though.
That does seem low power for your SM60. Great that you can now crank it up with the 90.


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

marktownley wrote: Sat Jun 06, 2020 7:20 am
Highbury Mark wrote: Fri Jun 05, 2020 7:50 pm Crossed my mind that maybe the single stack etalon on its own is unimpressive because it’s been specifically built to work with the second etalon? If I’d only ordered a single stack package, it might have been tuned differently? A question for the more technically knowledgeable forum members.
I think that's a question you need to ask Solarscope rather than rely on solarchat speculation.
I’ve only clocked up 20 minutes of viewing so far Mark so a lot more learning and experimenting to do. My question really related to any DS system like this - like the SMIII Coronado double stacks for example. Whether the single stack etalon is tuned differently if it’s to be used as part of a DS system.


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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

Highbury Mark,
I never have quite figured out why my SMII60 doesn't do that well at higher magnifications. I have seen people post here with 40mm PSTs getting 60 power. One guy claimed 150 power with his Lunt tilt-tuned 60! 60x is a rare thing with my SM60 and usually if I can do it at all it is with a bright prom in single-stack. So I stick where it does best, under 32x. That is one reason I seeked a bigger scope. Better high magnification capability for better resolution.

What does " clock " mean concerning a double-stacked filter?

James


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

I suppose my normal viewing magnification with the 60mm Lunt was no more than 40x - so not that different to you - always prefer small and sharp than pushing mag too much. Goes for the planets too - read about people viewing Venus with a 4” refractor at 450x!! I’d say there are probably 3-4 times a year when I can go up to 180-200x in white light, but it’s very rare. Highest solar ha mag I’ve managed (while maintaining sharpness) is about 100x with Quark through 4” refractor. Suspect that’s going to be my maximum with the new set up too. Will be interesting seeing how far you can go with the SM90 on those days of perfect seeing.
‘Clocking’ just means turning the (external) double stack filter on the end of your solar scope to position the sweet spot more centrally. There are adapters you can buy which allow you to do this without unscrewing the unit, though in practice you don’t have to turn it much to achieve better results. - so adapter not really necessary.


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Re: Solarscope SF70DS incoming

Post by Montana »

Mark, Solarscope should have done the clocking for you. I have a wide band (straight line band) which is the sweet spot. The only clocking I did was to make sure this wide sweet spot band is horizontal when you look at the Sun, then this wide horizontal band is exactly the same orientation as the camera chip for maximum evenness. Difficult to explain really but in no way have I ever had to unscrew and turn one filter in regards to the other, they should be matched for you. I have never thought about doing that and how that would change the large wide band.

On a second point, my single stack filter has never been the same since it was double stacked. It used to be amazing to use, now I never use it in single stack mode because it is very uninspiring, I do not know what Ken did to when it went in to be double stacked, this is why I wanted to get Helmut to check it over if I was ever in the Isle of Man. Maybe it was a deliberate change I don't know but if I could only twist the tuner further round I might be able to get it on band better. One of the changes, was that he changed the tuner so that 'on band' was right on one edge of the turn wheel rather than in the middle. The double stack is at the other end, this mean you never get a ghost even close, but on my single stack I can't always get on band either as it is past the tuning wheel end. It is a bit like my PST problem but that was easily rectified by changing the pin, I can't do that on the Solarscope.

There is always a problem with any brand and I guess you get used to it, but it is annoying on cold days when I cannot get on band and have to wait 30 minutes for the Sun to warm up the filter.

Alexandra


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Re: Solarscope SF70DS incoming

Post by Solar B »

I think that is a bit peculiar with regard to the solarscope in single stack ... I admit my only

experience with them is in SS mode but here the view was perfect and all on band , of course

the classic procedure is to tune the SS to most contrast before adding the DS unit , on a foot

note I've really always been a DS fan but this year I've been using SS much more and have

enjoyed what is perhaps the best compromise between surface and Limb detail.

And James I have often used my 60DS with a 10mm before the image has started to deteriorate

but more commonly with a 12mm.

Oh and Alexandra what's the PST pin you were referring to plz ?

Brian


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

Montana wrote: Mon Jun 08, 2020 7:21 am Mark, Solarscope should have done the clocking for you. I have a wide band (straight line band) which is the sweet spot. The only clocking I did was to make sure this wide sweet spot band is horizontal when you look at the Sun, then this wide horizontal band is exactly the same orientation as the camera chip for maximum evenness. Difficult to explain really but in no way have I ever had to unscrew and turn one filter in regards to the other, they should be matched for you. I have never thought about doing that and how that would change the large wide band.

On a second point, my single stack filter has never been the same since it was double stacked. It used to be amazing to use, now I never use it in single stack mode because it is very uninspiring, I do not know what Ken did to when it went in to be double stacked, this is why I wanted to get Helmut to check it over if I was ever in the Isle of Man. Maybe it was a deliberate change I don't know but if I could only twist the tuner further round I might be able to get it on band better. One of the changes, was that he changed the tuner so that 'on band' was right on one edge of the turn wheel rather than in the middle. The double stack is at the other end, this mean you never get a ghost even close, but on my single stack I can't always get on band either as it is past the tuning wheel end. It is a bit like my PST problem but that was easily rectified by changing the pin, I can't do that on the Solarscope.

There is always a problem with any brand and I guess you get used to it, but it is annoying on cold days when I cannot get on band and have to wait 30 minutes for the Sun to warm up the filter.

Alexandra
No - I won’t be changing the etalon positions with this new set up Alexandra - clocking was a technique that I picked up from other Lunt owners as the sweet spot was smaller and more pronounced with those scopes. TS in Germany sells the dedicated adapters for the LS60 DS - don’t know if you can buy similar adapters for Coronado? The two Solarscope etalons fit together so perfectly, with the two tuning dials in exactly the same place, there’s no question that they have been engineered to be precisely aligned.
From what you say, it does sound possible that SS etalons are retuned when prepared for double stacking. Have to say, after limited experience so far, double stack views are so impressive that I will never use it single stacked anyway. Also proms look just as good with DS as single stacked.


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Re: Solarscope SF70DS incoming

Post by Montana »

Mark, that's what I always think too, the prominences are just as bright, in fact more pronounced in DS!

Brian, both of my PSTs had tuning where centreline was right on the furthest extent of what you could twist the etalon and on some days it would be past what you could twist. If you take off the rubber gripper, unscrew the screw and pull forward the plate you will see a series of holes underneath. If you carefully remember to have the pin (screw) in the furthest point when you start then you can replace the ring back and screw the screw back in to the next hole along. You must remember where you are to start and only go one hole further along otherwise if you go too far you can over twist the etalon. I am absolutely scared stiff of touching and breaking my PST and yet I managed this (I felt rather proud after) so it must be an easy fix. Both PSTs work much better now.

Alexandra


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Re: Solarscope SF70DS incoming

Post by Solar B »

Yes prominences do appear more 3 dimensional when DS I think but I'm just going
with different things this summer , I'm using higher mags than I'd normally do to !

Thanks for the detail on the PST Alexandra ... I had seen it before under the rubber cover
but didnt know what it was for , I may have a wee tinker with one of my PSTs.

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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

Highbury Mark,
I have gotten my SMII90 up to 133x under good seeing conditions in single stacked configuration without losing detail. I think given the right conditions, excellent seeing and a bright feature I could exceed this. I was impressed by that. Double-Stacked the image is dimmer and disk details are usually of lower contrast than on the limb. Still I can reach 100x in DS, especially with brighter features. I typically use this scope between 32x and 80x. A much wider magnification range than I can use on my SMII60.

My Coronado SMII 90 does better on average on limb detail and prominences in SS. Given good seeing I can often see fine filamentary details and knots in the prominences and given good to excellent seeing the individual spicules. Double-Stack gives a significantly dimmer image not only because the sunlight passes through two filters but because the the 90mm external stacking etalon stops the scope's aperture down from 102mm to 90mm. That does make some difference in both image brightness and resolution. Still, DS does give excellent detail in brighter proms. The internal etalon of the SM90 is 60mm.

I had originally planned on getting a Lunt LS100Tha double-stacked scope. They proved formidably expensive. Too expensive, plus they replaced it with a modular version which I think cost a little more but having other decent nighttime refractors it was a capability low on my list. I didn't lose much with the big Coronado. 102mm in SS. Comparable with the Lunt and 90mm in DS just a little smaller. At half the price! I am not complaining at all! :)

It sounds like your 70mm Solarscope outperforms my 60mm Coronado by a fair margin.

James


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

Good stuff James. It’s a real benefit to have 4” single stack option - never knew that about the SM90.

Wasn’t expecting to do any solar observing today, but at 11am the clouds parted, and Gong showed a beautiful filament emerging from the main active region. I set up the TV85/SF70DS, got comfortable, threw the silver reflective blanket over me, and focused. Was greeted with stunning views of the solar disc, and particularly the filament - charcoal grey, sharply contrasted against the background AR. I’ve been solar observing for six years, but never experienced anything like this. Using my trusty Pentax XF zoom, I went up from 30x to 75x with no loss of sharpness, but even more detail of this superb filament. The active region showed beautifully too - almost photographic patterns of the chromosphere. All too soon the clouds put an end to the fun. But these filters are already exceeding expectations.
Still have to see how they perform with a binoviewer too - have a Baader 2.6x GPC on order so my BV can come to focus. Pairs of 40mm and 20mm Televue Plossls, and 25mm Fujiyama orthos will give magnifications between 38x and 75x. So looking forward to trying those. Only problem is the British weather - looks like we will be dodging clouds for the next couple of weeks.


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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

HM,
It sounds like you had an awesome viewing session. I am preparing to post mine shortly. It sounds like your Solarscope/TeleVue 85 setup compares more with my SMII90 than with my SMII60.

I see a binoviewer in my future too. I have two Cemax 25mm and two Cemax 12mm eyepieces as well as two Edmund 28mm RKE eyepieces.

James


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

Those RKEs should be wonderful for solar binoviewing - as long as you can position your eyes to take account of the long eye relief.
You probably know all this James - but it’s not necessary to spend a great deal on a binoviewer - I’ve just been comparing a £1,000 Baader Mark V with a £160 Skywatcher/OVL unit and the view on axis is almost the same. If you want wider fov without stretching to the expense of a Mk V/Denk/Televue, then Baader’s new Maxbright II is well worth a look.
BVs really are terrific for solar. Don’t think they actually show me more detail - they’re just much more comfortable.


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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

HM,
That is why I like the Edmund RKE eyepieces so much. I wear glasses and unless it is a high power eyepiece I require them for viewing. Eye relief is a must for me!

I had forgotten. I also have two 20mm and two 10mm MA eyepieces in my nighttime eyepiece case as well. 50 degree apparent field. Adequate for solar use. I certainly have enough multiple eyepieces for a binoviewer.

James


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

Update....
Getting to know the TV85/Solarscope set up has been faster than other scopes. After years of pressure tuned Lunts, there’s obviously less adjusting. At first you almost miss revving up that Lunt piston, but for inveterate fiddlers like me it’s now easier to focus on observing. Detail, sharpness and contrast of solar features are so excellent that there’s no compulsion to keep trying to improve the view. It’s all there in front of you.
Having said that, I still need to work out how to centre the “sweet spot” (which is about half the fov) when using a single eyepiece. The reason I haven’t done so yet is because I’ve now managed to reach focus with both of my binoviewers (one a cheap Chinese instrument and TV40mm Plossls producing 30x, and the other a Baader MkV with 1.7X GPC and AP Barcon producing about 65x) - both BVs effectively solve the sweet spot issue. As I expect to use the MkV 80% of the time I’m leaving the tuning as it is right now. Will be pushing the MkV up to 100x next time the seeing allows, but at 65x this afternoon, despite a relatively inactive Sun, the view was just gorgeous.
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Re: Solarscope SF70DS incoming

Post by marktownley »

How and why do the BVs help the sweet spot?


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

marktownley wrote: Sat Jun 13, 2020 8:23 pm How and why do the BVs help the sweet spot?
They centre it - at least at the tuning positions I’ve been using so far.


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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

I wonder how the binoviewer would affect the sweet spot in my tilt-tuned Coronados? Similarly, I guess?


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

Well worth trying James. I don’t remember binoviewing making much of a difference to sweet spots of previous Lunts, but with this set up it’s marked.
Playing around a bit more with the tuning of both filters today has shown me I haven’t yet found perfect tuning position for both cyclops and binoviewing. Another issue is physically reaching the far tuner while observing - I’m 6ft 5ins and I can only just reach. Having fun though...


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

Forgot to say, very nice image adorning the cover of the Solarscope manual by Alexandra! :bow
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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

Highbury Mark wrote: Sun Jun 14, 2020 1:46 pm Well worth trying James. I don’t remember binoviewing making much of a difference to sweet spots of previous Lunts, but with this set up it’s marked.
Playing around a bit more with the tuning of both filters today has shown me I haven’t yet found perfect tuning position for both cyclops and binoviewing. Another issue is physically reaching the far tuner while observing - I’m 6ft 5ins and I can only just reach. Having fun though...
Highbury Mark,
I too have trouble reaching the far tuner of the SMII90 ( DS etalon ) as well. I have to tune-look-repeat until I get it right. The SMII60 is so much easier since I can reach the DS tuner wheel with ease while I am looking through the eyepiece.

James


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

After living with these filters for a few weeks, have to say they have exceeded my expectations in almost every way. They produce breathtakingly beautiful views of the sun in ha. Have now perfected tuning - which no longer requires adjustment, so scope is ready for observing at all times. Mostly use Baader MkV binoviewer with TeleVue Plossls and Fujiyama orthos, Pentax XF zoom for cyclops. The surface detail is intoxicating - incredible contrast on filaments and detail on proms, on a different level to my previous double stacked Lunt 50 and 60, though still need to move the disc around the fov with my Skytee 2 to bring out the best in each feature. Can get proms and filaments perfected together, but need to slew the image around to pick up best detail in active regions. The other remarkable thing is I can push the power up to 80x-90x with no loss of sharpness. Views over the past few weeks have been among the most stunning I’ve had in over 20 years of astronomy.


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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

HM,
It sounds like you found your ideal scope. My Coronado's too often hold tuning well but I often knock them off removing the front etalon and sometimes moving the scope around. Still, by what I have read Solarscope and Solar Spectrum etalons rate higher than Coronado and Lunt do. Enjoy the views my friend.

If you are like me you wish you could have gotten into Ha years sooner.

James


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

DeepSolar64 wrote: Fri Jul 10, 2020 3:19 am HM,
It sounds like you found your ideal scope. My Coronado's too often hold tuning well but I often knock them off removing the front etalon and sometimes moving the scope around. Still, by what I have read Solarscope and Solar Spectrum etalons rate higher than Coronado and Lunt do. Enjoy the views my friend.

If you are like me you wish you could have gotten into Ha years sooner.

James
Thank you James.I’m so pleased you are getting such fine views with your new scope too. I totally relate to your last comment - I’m 56 now and only started solar ha observing 5-6 years ago - but then I could never have afforded this expensive equipment years ago. Am just appreciating that I’m able to enjoy the magic of ha solar as an enthusiastic amateur today


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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

HM,
I have been doing white light for many years but I am very new to Ha. Only a year and a half! I almost bought a PST back in 2013 but my budget at that time was too tight to comfortably afford one. I do now wish I would have taken the dive then. I am 55 so our ages are pretty close.

James


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

DeepSolar64 wrote: Sun Jul 12, 2020 12:39 am HM,
I have been doing white light for many years but I am very new to Ha. Only a year and a half! I almost bought a PST back in 2013 but my budget at that time was too tight to comfortably afford one. I do now wish I would have taken the dive then. I am 55 so our ages are pretty close.

James
Being relatively late starters just means we have a lot of catching up to do. Like you I’m out at every available opportunity. I spent 30 minutes today staring at a near blank solar disk. With binoviewer and 32mm Plossls, was getting around 50x. One tiny filament, couple of minute proms, but it was beautiful - still lots of surface detail to appreciate


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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

Highbury Mark wrote: Thu Jul 16, 2020 4:04 pm
DeepSolar64 wrote: Sun Jul 12, 2020 12:39 am HM,
I have been doing white light for many years but I am very new to Ha. Only a year and a half! I almost bought a PST back in 2013 but my budget at that time was too tight to comfortably afford one. I do now wish I would have taken the dive then. I am 55 so our ages are pretty close.

James
Being relatively late starters just means we have a lot of catching up to do. Like you I’m out at every available opportunity. I spent 30 minutes today staring at a near blank solar disk. With binoviewer and 32mm Plossls, was getting around 50x. One tiny filament, couple of minute proms, but it was beautiful - still lots of surface detail to appreciate
Having a relatively blank disk just gives us more of a challenge. We can hone our skills during solar minimum and then when solar max comes we will be polished and will be able to see features most would require lucky imaging to see! And by waiting as long as we did, equipment has became more affordable. 15-20 years ago a 90mm Ha scope would have cost as much as a lower end new car!


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Losmandy AZ8 Alt/Az Mount
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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

DeepSolar64 wrote: Thu Jul 16, 2020 6:09 pm
Highbury Mark wrote: Thu Jul 16, 2020 4:04 pm
DeepSolar64 wrote: Sun Jul 12, 2020 12:39 am HM,
I have been doing white light for many years but I am very new to Ha. Only a year and a half! I almost bought a PST back in 2013 but my budget at that time was too tight to comfortably afford one. I do now wish I would have taken the dive then. I am 55 so our ages are pretty close.

James


Being relatively late starters just means we have a lot of catching up to do. Like you I’m out at every available opportunity. I spent 30 minutes today staring at a near blank solar disk. With binoviewer and 32mm Plossls, was getting around 50x. One tiny filament, couple of minute proms, but it was beautiful - still lots of surface detail to appreciate
Having a relatively blank disk just gives us more of a challenge. We can hone our skills during solar minimum and then when solar max comes we will be polished and will be able to see features most would require lucky imaging to see! And by waiting as long as we did, equipment has became more affordable. 15-20 years ago a 90mm Ha scope would have cost as much as a lower end new car!

Definitely James. It’s fascinating the way the market has developed. Was reading about the ‘Baader Coronagraph‘ today (there’s a great piece about restoring one by Alexandra on her website solarnutcase) - a relatively rudimentary device for observing proms - very wideband compared to today’s scopes. And that was selling for about $2,300 in the States in the 1990s, not that long ago. Wonder how much a double stacked SM90 was at launch?


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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

Highbury Mark wrote: Fri Jul 17, 2020 9:58 am
DeepSolar64 wrote: Thu Jul 16, 2020 6:09 pm
Highbury Mark wrote: Thu Jul 16, 2020 4:04 pm



Being relatively late starters just means we have a lot of catching up to do. Like you I’m out at every available opportunity. I spent 30 minutes today staring at a near blank solar disk. With binoviewer and 32mm Plossls, was getting around 50x. One tiny filament, couple of minute proms, but it was beautiful - still lots of surface detail to appreciate
Having a relatively blank disk just gives us more of a challenge. We can hone our skills during solar minimum and then when solar max comes we will be polished and will be able to see features most would require lucky imaging to see! And by waiting as long as we did, equipment has became more affordable. 15-20 years ago a 90mm Ha scope would have cost as much as a lower end new car!

Definitely James. It’s fascinating the way the market has developed. Was reading about the ‘Baader Coronagraph‘ today (there’s a great piece about restoring one by Alexandra on her website solarnutcase) - a relatively rudimentary device for observing proms - very wideband compared to today’s scopes. And that was selling for about $2,300 in the States in the 1990s, not that long ago. Wonder how much a double stacked SM90 was at launch?

According to Stephen Ramsden a SM90 at launch back in the mid-late 1990s was about 14.000 dollars! I don't know whether this is a double-stacked or single-stack version. And to think I bought a DS version for 3.500. That's quite a reduction!


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Re: Solarscope SF70DS incoming

Post by george9 »

If I remember correctly, the Coronado AS1-90 was around $5500 in 2000, or $11,000 double stacked. I don't remember if that came with the blocking filter. The 60mm ASP-60 was $2650, and the 140mm filter was around $13,000.

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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

george9 wrote: Fri Jul 17, 2020 5:40 pm If I remember correctly, the Coronado AS1-90 was around $5500 in 2000, or $11,000 double stacked. I don't remember if that came with the blocking filter. The 60mm ASP-60 was $2650, and the 140mm filter was around $13,000.

George
So the AS1-90 was a single stacked external etalon George? Also - didn’t know there was a 140mm Coronado filter!! Anyone on the forum still have one?


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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

I have read that the pre-Meade Coronado made etalons bigger than 90mm. At one time Coronado made a CaK PST. It's gone too. Did Coronado ever make CaK filters in the diagonal-style like Lunt does now?


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Re: Solarscope SF70DS incoming

Post by george9 »

Yes, the "AS-1 90" was a single stack front-mounted filter that threaded onto the front of a Televue 101 refractor. Similar design to the current Meade front-mounted filters. It evolved to the SolarMax. I had its little brother, the ASP-60 (P stood for Televue Pronto, which it screwed into).

Bob Y. has a 140mm currently and has posted about it.

Coronado did have professional CaK filters in the 1990s and early 2000s for special order. But I think the PST was their main mass market CaK entry. Others may know more.

George


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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

Was the AS-1-90 a David Lunt design? David after all started and owned Coronado before selling it to Meade before he died. I always wondered why it wasn't passed down to his son Andy who is CEO of Lunt Solar Systems today.


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

Quick update on how the TV85/SF70DS is performing. We’ve had some particularly steady seeing recently to complement raised solar activity, so I’ve been able to push up magnification through my binoviewers. Yesterday I was observing the active region at an amazing 140x (TeleVue Plossls 11mm, MarkV BV with 2.6x GPC) - a crazy power for a 70mm aperture system, yet the views remained sharp and relatively bright. That’s almost double the mag I tended to use with the Lunt LS60DS. And I could have gone higher. Obviously the contrast and finesse of the etalons are key, but am sure that the excellence of the TV85’s ED optics play a part.


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

Today complete mush at 38x......


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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

HM,
Your TV85-SS combo absolutely kills my Coronado SolarMax II 60. 50x is about max for it and I usually use it more at 16x- 21.5x-33x. I have to use the SMII90 to compete. 100x is usually easy with it and I have on occasions with really good seeing successfully used it in single stack as high as 200x.

JP


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

DeepSolar64 wrote: Thu Aug 20, 2020 5:26 am HM,
Your TV85-SS combo absolutely kills my Coronado SolarMax II 60. 50x is about max for it and I usually use it more at 16x- 21.5x-33x. I have to use the SMII90 to compete. 100x is usually easy with it and I have on occasions with really good seeing successfully used it in single stack as high as 200x.

JP
Wow - 200x must be incredible James when seeing allows. Must say I never expected to go as high as 140x - it’s probably only going to happen a few times each year. I was all set to sell my 15mm and 11mm TV Plossls as thought they’d be redundant, but thankful I didn’t.


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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

I love the SMII90. It does really well at powers 100x and beyond. Seeing is usually the limit. Single-Stack will usually take the highest powers best because the image is brighter through a single etalon versus through two. Still, even with double I often can easily exceed 100x again with seeing usually being the limit. I just wish I could use higher magnification on my SMII60.

I typically run lower with the 90. Usually 32x to 100x.


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Re: Solarscope SF70DS incoming

Post by Highbury Mark »

DeepSolar64 wrote: Thu Aug 20, 2020 6:06 pm I love the SMII90. It does really well at powers 100x and beyond. Seeing is usually the limit. Single-Stack will usually take the highest powers best because the image is brighter through a single etalon versus through two. Still, even with double I often can easily exceed 100x again with seeing usually being the limit. I just wish I could use higher magnification on my SMII60.

I typically run lower with the 90. Usually 32x to 100x.
It’s for this reason that I’m probably going to sell my Quark. With its in-built 4.2x barlow, and used with my 4” refractor, it’s often just too much for our seeing, even with a 40mm plossl and a 0.5x reducer.


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Re: Solarscope SF70DS incoming

Post by DeepSolar64 »

I know what you mean. Daytime heating here only occasionally lets me use magnifications above 100x.


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Re: Solarscope SF70DS incoming

Post by Radon86 »

Hi,
I am not sure if this thread is permanently closed now. Just wondering if we can get a brief glimpse of the imaging by Highbury Mark with the Solarscope double stack SF70 filters ??

Thanks.
Magnus


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