Ha Double Stacked Sun 26th July

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Ha Double Stacked Sun 26th July

Post by marktownley »

Much to my surprise this morning dawned with clear skies, and given the weather we have forecast for the coming week I thought it prudent to make the most of things.

First job was to check out my new el-cheapo focal reducer for the full disk, which I found didn't offer enough reduction as I would have liked, so a little tweaking with the spacing of the lens in the cell and I managed to get the suns disk nicely on the chip. The use of the reducer also now does away with the Baader solar telecompressor and spacers that were used, and reduces the weight of my double stack setup by a couple of hundred grams, this might not sound much, but the overall weight is at the limit for the mount, and more importantly the weight is being removed from the end of the turning moment, so should just ease things up for the solarquest when i'm on my travels. I actually thing the cheapo reducer gives a better view than the solar compressor ever did. Scope used was a 50mm Lunt etalon on the 60/360 frac, double stacked with a Quark and then the ICX814 chipped camera.

ImageHa-FD-DS by Mark Townley, on Flickr

Next up I decided to try out the double stacked Coronado SM90, and using the ZWO 290mm camera along with a Cemax barlow to get me up to around f16. The seeing was really boing and it took a lot of frames distilled back to only a few to get some workable data. The 2 active regions looked great, with all that angry plage and filaments...

ImageAR12847-Ha-DS90-f16-290mm by Mark Townley, on Flickr

ImageAR12846-Ha-DS90-f16-290mm by Mark Townley, on Flickr

Pleased to get these as was expecting to be cloudy today, any more for the rest of the week will be opportunistic between the showers. Hope you like!

Mark


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Re: Ha Double Stacked Sun 26th July

Post by dhkaiser »

Well done Mark!


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Re: Ha Double Stacked Sun 26th July

Post by RodAstro »

Hi Mark
That looks like a good setup for holidays, the double stack gives some awesome contrast.
How is it visually?

Cheers Rod


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Re: Ha Double Stacked Sun 26th July

Post by Stardust5858 »

Brilliant Mark, similar views to what I saw today. Some amazing filaments. Thanks for sharing.


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Re: Ha Double Stacked Sun 26th July

Post by EGRAY_OBSERVATORY »

Excellent captures Mark.
The exposure/processing has shown very well the action on the disk.

Thanks for sharing
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Re: Ha Double Stacked Sun 26th July

Post by Montana »

Wow!! superb details in the close ups :hamster: :bow

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Re: Ha Double Stacked Sun 26th July

Post by Rusted »

Those are excellent! :bow

What is this "El-cheapo" focal reducer you talk about?


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Re: Ha Double Stacked Sun 26th July

Post by Astrophil »

Very nice, Mark. Always a quality presentation.
Thanks,
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Re: Ha Double Stacked Sun 26th July

Post by DeepSolar64 »

Mark,
I have thought about getting an el-cheapo focal reducer for the 90. What brand did you get?

https://optcorp.com/products/tpo-1-25-f ... -extension

Nice images!

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Re: Ha Double Stacked Sun 26th July

Post by marktownley »

Thanks everyone for the kind words, this is focal reducer I got https://www.ebay.co.uk/itm/383572165450

Visually both scopes are pretty contrasty, certainly all in the images is easy to the eye. The DS90 has a bit less uniformity across the disk, but is absolutely fine for these mid scale closer views... I often spend quite a bit of time taking in a visual with the DS90 as there is so much fine detail to be seen, today was no exception.


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Re: Ha Double Stacked Sun 26th July

Post by DeepSolar64 »

As long as it works....


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Re: Ha Double Stacked Sun 26th July

Post by pedro »

Great DS shots Mark, lots of action


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Re: Ha Double Stacked Sun 26th July

Post by arnedanielsen »

Beautiful work, Mark! Thanks for sharing!

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Re: Ha Double Stacked Sun 26th July

Post by p_zetner »

Beautiful images, Mark.
Lovely disk and mid-scale views.
Cheers.
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Re: Ha Double Stacked Sun 26th July

Post by marktownley »

Thanks everyone for the kind words, much appreciated!


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Re: Ha Double Stacked Sun 26th July

Post by DavidP »

There is some really nice detail there. I like the restraint in your processing. Well done.


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Re: Ha Double Stacked Sun 26th July

Post by Valery »

Very nice and delicate FD and absolutely beautiful high resolution images. A very lucky day instead of overcast!


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Re: Ha Double Stacked Sun 26th July

Post by Carbon60 »

Cracking images, Mark. Lovely details and nice contrast.

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Re: Ha Double Stacked Sun 26th July

Post by Valtori »

Very beautiful DS images!!

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Re: Ha Double Stacked Sun 26th July

Post by MAURITS »

Great result Mark with the new reducer, lots of details.


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Re: Ha Double Stacked Sun 26th July

Post by ffellah »

These are fabulous Mark, with your traveling kit. A pleasure to see, incredible detail and excellent contrast.

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Re: Ha Double Stacked Sun 26th July

Post by marktownley »

Thanks everyone for the kind words, thunderstorms here these past 2 days, hopefully Thursday morning is going to give me a window of opportunity.


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Re: Ha Double Stacked Sun 26th July

Post by Ivan »

Mark, these are wonderful pictures, wonderful processing, I would say that these are reference pictures to be looked up to.

Ivan


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Re: Ha Double Stacked Sun 26th July

Post by minhlead »

marktownley wrote: Mon Jul 26, 2021 12:39 pm Much to my surprise this morning dawned with clear skies, and given the weather we have forecast for the coming week I thought it prudent to make the most of things.

First job was to check out my new el-cheapo focal reducer for the full disk, which I found didn't offer enough reduction as I would have liked, so a little tweaking with the spacing of the lens in the cell and I managed to get the suns disk nicely on the chip. The use of the reducer also now does away with the Baader solar telecompressor and spacers that were used, and reduces the weight of my double stack setup by a couple of hundred grams, this might not sound much, but the overall weight is at the limit for the mount, and more importantly the weight is being removed from the end of the turning moment, so should just ease things up for the solarquest when i'm on my travels. I actually thing the cheapo reducer gives a better view than the solar compressor ever did. Scope used was a 50mm Lunt etalon on the 60/360 frac, double stacked with a Quark and then the ICX814 chipped camera.

ImageHa-FD-DS by Mark Townley, on Flickr

Next up I decided to try out the double stacked Coronado SM90, and using the ZWO 290mm camera along with a Cemax barlow to get me up to around f16. The seeing was really boing and it took a lot of frames distilled back to only a few to get some workable data. The 2 active regions looked great, with all that angry plage and filaments...

ImageAR12847-Ha-DS90-f16-290mm by Mark Townley, on Flickr

ImageAR12846-Ha-DS90-f16-290mm by Mark Townley, on Flickr

Pleased to get these as was expecting to be cloudy today, any more for the rest of the week will be opportunistic between the showers. Hope you like!

Mark
Excellent shot, Mark.
I am interested in the reducer you are using since I am intending to make fulldisk animation myself. I posted a question about reducer here. Would you mind take a look? I 'd like the name and brand of the reducer you are using. viewtopic.php?f=4&t=32839


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Re: Ha Double Stacked Sun 26th July

Post by marktownley »

Thanks Minh, it's just a generic cheap unbranded 0.5x reducer...

https://www.ebay.co.uk/itm/383572165450


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Re: Ha Double Stacked Sun 26th July

Post by minhlead »

marktownley wrote: Fri Jul 30, 2021 11:39 am Thanks Minh, it's just a generic cheap unbranded 0.5x reducer...

https://www.ebay.co.uk/itm/383572165450
Do you experienced vignetting with this? Since I got horrible vignetting with a similiar 1.25 inches chinese reducer


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Re: Ha Double Stacked Sun 26th July

Post by marktownley »

Nope, just got to get the spacing from chip right.


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Re: Ha Double Stacked Sun 26th July

Post by minhlead »

marktownley wrote: Fri Jul 30, 2021 11:50 am Nope, just got to get the spacing from chip right.
How much spacing did you use?
Last edited by minhlead on Fri Jul 30, 2021 12:42 pm, edited 1 time in total.


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Re: Ha Double Stacked Sun 26th July

Post by marktownley »

Not sure really, added about 4 or 5mm on top of the reducer to chip distance. Just really till I got a frame with a reasonable amount of space around the sun and edges of chip for any mount drift...


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Re: Ha Double Stacked Sun 26th July

Post by minhlead »

marktownley wrote: Fri Jul 30, 2021 12:42 pm Not sure really, added about 4 or 5mm on top of the reducer to chip distance. Just really till I got a frame with a reasonable amount of space around the sun and edges of chip for any mount drift...
Could you please take a picture of how you attached the reducer to your camera please?


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Re: Ha Double Stacked Sun 26th July

Post by marktownley »

It's c-mount, so it just screws on

ImageP1010252 by Mark Townley, on Flickr


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Re: Ha Double Stacked Sun 26th July

Post by minhlead »

marktownley wrote: Fri Jul 30, 2021 12:49 pm It's c-mount, so it just screws on

ImageP1010252 by Mark Townley, on Flickr
Thanks, Mark!
What camera are you using?


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Re: Ha Double Stacked Sun 26th July

Post by marktownley »

Hi Minh, it's a FLIR Grasshopper 3 U3916M

https://www.edmundoptics.co.uk/p/gs3-u3 ... era/30337/


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Re: Ha Double Stacked Sun 26th July

Post by minhlead »

marktownley wrote: Fri Jul 30, 2021 2:43 pm Hi Minh, it's a FLIR Grasshopper 3 U3916M

https://www.edmundoptics.co.uk/p/gs3-u3 ... era/30337/
Hmm. Interesting. AFAIK, reducer will only provide a illuminated field about half of the reducer's aperture . In this case a 1.25 inches with 22.5mm clear aperture will have 11-12 mm illuminated field at best. You sensor is 16mm in diagonal. Do you experience vignetting with this reducer?


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Re: Ha Double Stacked Sun 26th July

Post by marktownley »

I get the full sun in 'one take' as per the images, if I crank the exposure right up you can see the image circle, the very corners of the chip will be vignetted, but that doesn't matter as the sun isn't there...


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Re: Ha Double Stacked Sun 26th July

Post by minhlead »

marktownley wrote: Fri Jul 30, 2021 3:42 pm I get the full sun in 'one take' as per the images, if I crank the exposure right up you can see the image circle, the very corners of the chip will be vignetted, but that doesn't matter as the sun isn't there...
Oh ok. I Get it now. If it's not too much trouble. Could I ask for a stretched raw frame so I can see how big the image circle are on your sensor?


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Re: Ha Double Stacked Sun 26th July

Post by marktownley »

minhlead wrote: Fri Jul 30, 2021 3:52 pm
marktownley wrote: Fri Jul 30, 2021 3:42 pm I get the full sun in 'one take' as per the images, if I crank the exposure right up you can see the image circle, the very corners of the chip will be vignetted, but that doesn't matter as the sun isn't there...
Oh ok. I Get it now. If it's not too much trouble. Could I ask for a stretched raw frame so I can see how big the image circle are on your sensor?
Will have to be next time I image a full disk, have spent the afternoon decluttering the hard drive of solar stuff going back to may. I will when I can, maybe sunday, looking at the weather...


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Re: Ha Double Stacked Sun 26th July

Post by marktownley »

If it helps, the sensor is 3300x2700 (ish) and I run a ROI of 2600x2500 when I image, solar disk is just over 2400 pixels across, not measured it, but is roughly that big...


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Re: Ha Double Stacked Sun 26th July

Post by minhlead »

marktownley wrote: Fri Jul 30, 2021 3:58 pm If it helps, the sensor is 3300x2700 (ish) and I run a ROI of 2600x2500 when I image, solar disk is just over 2400 pixels across, not measured it, but is roughly that big...
Thanks, Mark. If you have that image, just give me a message will you?


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Loves from Viet Nam <3
My gear:
Scope: SkyRover (Kunming Optics) 152mm F/6 Doublets
Mount: JTW Tridents GTR
Camera:
PlayerOne Apollo M-Max
Quark Chromosphere Doublestacked with PST etalon
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