90mm Triplet with barlow and Quark

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AndiesHandyHandies
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90mm Triplet with barlow and Quark

Post by AndiesHandyHandies »

Hi

One of my modded scopes and h-alpha filters sets.

The 90mm F6.7 triplet is from TS. The tube has shallow baffles but the walls are flocked.

I am using a 3x long revelation Barlow. A Mark T alert £29.

Combo Quarks, Prominence and a selected Chromosphere for a Sky at Night solar imaging record breaking attempt, one of 4 I am told by Mark T.

Set up has 2" Baader 35nm and Beloptik KG3 on the front of a Baader T2 diagonal. Normal eyepieces are 25mm Clave' or a 32mm Meade Super-Symetric to get a brighter view.

This has been a dark background set up from the start.

I have improved the barlow with a stop before the lens, and now an additional one after the lens with Black3ed 180 Emery paper as flocking after. This has improved the background darkness further. Baffles from 25mm 'penny washers'. I use cobalt twist drills or tungsten carbide tipped bits as they are hardened steel. Tidy up with a file or Dremel.

Seeing was not good yesterday but had a reasonable view of the proms.

Cheers. Andrew.


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Re: 90mm Triplet with barlow and Quark

Post by marktownley »

Nice! Glad it is all working, would be very interested in some schematics / details / photos of the barlow mod.


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Re: 90mm Triplet with barlow and Quark

Post by AndiesHandyHandies »

Hi

From right to left working up.

A Celestron/Skywatcher PLASTIC Moon filter which takes a 25mm filter or PST lens which I first found the filter for. From Carmarthen Cameras. People are putting cheap Chinese steel filters in those boxes I found out the hard way. Not suitable.

In it is a 25mm 'penny' washer. Rodastro tried to turn stops using the washers in his lathe but hard metal so could not hold well enough.

I have 4,5,6mm Cobalt steel drills and 8mm, 10mm and 12mm Tungsten Carbide tipped drills from my handyman days. They will go through, using the first ones as pilot for larger sizes. Do leave a burr and not very round, handheld drill in vice. My drill press is at my old house still. File or dremel to finish. I have looked round for 25mm Brass washers. The hole is 6.7mm as a baffle? x 3 = 20mm. I must admit not checked where it is relative to the focal plane so could be a bit small.

The third has a plastic holding ring from a filter, another panny washer 9.3mm as a baffle, just to mask off lens edge reflections, and a rubber washer I found on the ground walking in town. I have 3 of these I think, possibly from a drinks bottle? 20.3mm ID and 25mm OD. Taped together with black electricians tape. The rubber ring with the tape just pushes in the silver barrel.

Piece of 180 grit emery paper. I thin B2 and B3 50/50 water and keep in little NT Jam Jars. B2 as undercoat to use up then B3. One is brownish and one blueish so maybe blacker overall. Overlapping to act as a stop for the second baffle.

Then a piece of blackened emery in the front of the eyepiece holder.

https://live.staticflickr.com/65535/513 ... c221_b.jpg

https://live.staticflickr.com/65535/513 ... 6a0c_b.jpg

https://live.staticflickr.com/65535/513 ... 2d9c_b.jpg

Cheers. Andrew.


AndiesHandyHandies
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Re: 90mm Triplet with barlow and Quark

Post by AndiesHandyHandies »

Hi

Serendipity.

I had forgot to add a bit on as about 110mm+ infront of the focal plane.

Playing around with steel ruler to see what coming out of back upped it to 9mm.

Cheers. Andrew.


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Re: 90mm Triplet with barlow and Quark

Post by AndiesHandyHandies »

Hi

Went out early even though sun over houses to check out my baffling from basics.

Checked back focus.

Checked the 3x barlow baffling direct on the focusser.

Added the T2 Diagonal with 1.25" T2 eyepiece holder.

I said to Rodastro I was getting more than 3x and he pointed out the Quark on the barlow increases the back focus needed. Needed 67mm more.

This means the focal plane is very close to the front of the barlow, so my 6.7mm baffle is appropriate, possibly checked spot size there.

The Sun just fills the 32mm Meade and 40mm Celestron field with 27mm internal aperture. So 27 / 6 = 4.7x.

So F6.7 x 4.7 = F31.49. The sweet spot is about half the Clave' 25mm field. So suitable for visual or partial Sun imaging.

Similarly to my F28 on a PST mod working with a ED 2x Barlow working at F4.

Checked the Prom and Chromo with the 3x Revelation at 4.7x and the Quark Barlow at 4.2x and the images are similar. Nearly par-focal.

Cheers. Andrew


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Re: 90mm Triplet with barlow and Quark

Post by AndiesHandyHandies »

Hi

Had a session this am. Sunny between clouds, seeing OK after a bit.

90mm F6.7 Triplet, 2" Baader 35nm, KG3

Quark Chromo

Quark 4.2x Clave' 25mm

I could see all the surface features shown on Gong and proms.

Quark Prom

Quark 4.2x Clave' 25mm

Sun surface is bright, see the proms.

Revelation 3x Barlow With baffles before and after lens. Clave' 25mm

Slightly larger image so proms clearer. Sweet spot in centre. About half the field.

Some scatter.
Hopefully off-axis adapters will reduce scatter from mica cleavage damage. And good for prom imaging.

Cheers. Andrew.


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Re: 90mm Triplet with barlow and Quark

Post by marktownley »

Thanks Andrew, I enjoyed the views this morning too before the clouds came in.


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Re: 90mm Triplet with barlow and Quark

Post by AndiesHandyHandies »

Hi

Went out for a quick look over the house but turned out to be nicer than forecast.

3x Revelation and Quark Prom. Clave' 25mm

I had a look at the baffling as still a bit of scatter.

I had a 2" 35nm and KG3 on a 30mm extension in front of the diagonal, with another as an extension in front for finger guard when re-use the diagonal.

Turned out the sun was reflecting off the inside of the front two extension tubes. So removed them.

The telescope baffling baffled the bits of flock I used to tilt the filters.

I had a 6.7mm baffle infront of the barlow lens and a 8mm after. I found the 6.7 was vignetting the field. So removed it. With the previous improvement was not needed. So the barlow as is is ok for night time use as well.

I could see the proms on Gong and the sunspots.

4.2x Quark Chromo

Nice dark background as usual and good details on the surface. Used the 40mm Celestron Plossl to give a brighter view.

Cheers. Andrew.


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Re: 90mm Triplet with barlow and Quark

Post by marktownley »

I like how your systems continually evolve Andrew! :)


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Re: 90mm Triplet with barlow and Quark

Post by AndiesHandyHandies »

Hi Mark,

The senior technician in the first year physics lab at Birmingham Uni said I was the best experimental physicist he had seen in the lab. Also my IT logic skills and an enquiring mind keep popping up new ides after my 'overnight index re-builds'.

I did try an ES 2x tele-extender on my 80mm F5 Gold with the bare PST this am but not on band. Subsequent to your comment yesterday.

I am pretty happy with my two Quarks now. I use the 3x Revelation on the Combo Prom as doing visual. When I start imaging I will be picking off the edge of the etalon to avoid cleavage damage in a sector so a central sweet spot is OK. And leave the 4.2x on the Chromo.

PST mod on the MAK180 good for proms even wtth a 8mm sweet spot, also only 8mm is fully illuminated anyway.

Cheers. Andrew


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Re: 90mm Triplet with barlow and Quark

Post by marktownley »

Tee hee hee. My systems are always evolving too... Been playing with the CaK setup over the past couple of days to eek a bit more out of it hopefully...


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Re: 90mm Triplet with barlow and Quark

Post by AndiesHandyHandies »

Bit of sun tho over the houses.

Try the 100mm F5 stopped down to F10 with the ES 2x and PST.

Thinking about 80mm F15.

Rodastro was on ebay lusting after similar OTA he had in past so I leant over and pressed the buy button and gave him £20. Try my barlows on that when he gets back from holiday.

Threatening to get me imaging.

Cheers. Andrew.


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Re: 90mm Triplet with barlow and Quark

Post by AndiesHandyHandies »

Hi

Had a brief sunny spell this morning.

Tried out my two off-axis adapters RodAstro made for me to pick out a 10mm circle from the best edge part of the Prominence Quark with a 120deg sector with cleavage? damage. Bodged on a 4.2x so vignetted by its smaller blocking filter but works OK. Just need to black up the newest one.

RodAstro borrowing the Combo front to try his DS60 etalon with the Baader TZ2 on the "just a 6 F15"'.

Cheers. Andrew.


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Re: 90mm Triplet with barlow and Quark

Post by marktownley »

Sounds like productive experimenting!


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Re: 90mm Triplet with barlow and Quark

Post by AndiesHandyHandies »

Hi

Spent some time at the weekend baffling and B3ing my off-axis set for the Prominence Quark.

Had a small gap in the clouds today. Light breeze.

Baader 35nm, Beloptik KG3, Baader T2 diagonal, VK 3x TC, off-axis, Quark Prominence, on-axis, Clave' 25mm

Quiet a bit of scatter. Saw a few of the proms.

Taking out the Quark the scatter seemed to be off the 2" nose-piece on the T2.

The off-axis set up was dark apart from 3 baffle edges.

Scavenged a T2 to 28.5mm out of the PST Mod.

Added a 20mm stop to the 48mm to 28.5mm holding the 2" Baader 35nm in.

Put the T2 to 28.5mm on the front of the diagonal with a 16mm filter stop in it.

Looks better, see how it performs one day.

Cheers. Andrew


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Re: 90mm Triplet with barlow and Quark

Post by marktownley »

Interesting the scatter is from the 2" nosepiece, was it a 'shiny' chromed finish or a black 'painted; finish?


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