First images with our new Ha set up 29 July 2022

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Averton
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First images with our new Ha set up 29 July 2022

Post by Averton »

After seeing RodAstro's set ups using the Daystar Solar Scout quark on other scopes we have completed our own similar set up. Thanks Rod for the idea :)
We removed the Quark filter from our Daystar Solar Scout 60 and 3D printed an adapter to an M42 thread to mount it on our 72ED, with the addition of an ERF in front of the Quark. The result gives a focal ratio of 24.36 which is getting better for the Quark than the 15.5 of the Scout. There are a number of issues still to resolve but we are happy with our first attempt at imaging with this set up.
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2022-07-29 AR3062 and 3066 inv small.jpg
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Re: First images with our new Ha set up 29 July 2022

Post by FRAZ »

:D Some really nice clean prominence detail on those shots.


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Re: First images with our new Ha set up 29 July 2022

Post by Averton »

Thanks Fraz :)


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Re: First images with our new Ha set up 29 July 2022

Post by marktownley »

Really promising results there, that works well!


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Re: First images with our new Ha set up 29 July 2022

Post by pupak »

Great idea.


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Re: First images with our new Ha set up 29 July 2022

Post by Averton »

Thanks Mark & Pupak.
We are pretty happy with the results so far with this set up. It looks like it is a keeper.


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Re: First images with our new Ha set up 29 July 2022

Post by Oak »

Very nice! Have you re-tuned that quark on the new setup? I would you would need to slightly lower the temperature.


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Re: First images with our new Ha set up 29 July 2022

Post by Averton »

Thanks Derek. Your assumption is 100% correct, we have not experimented with the tuning yet.
We have only used the set up twice and on the first occasion we were still drilling and tapping the holes in the housing while setting it up, so rushed to say the least. We did not even expect to get useful images on that try. On the second occasion the weather didn't permit any more experimentation.
BTW what clues do you look for in an image to determine the direction required for correct tuning?
You suggest lowering the temperature which from our understanding would be a blue shift ie. CCW click of the tuning knob.
We are already 3 clicks CCW to the blue. We have noticed on many posts that people seem to end up needing significant blue shift, if not all available 5 clicks on the Scout etalon.
Thanks again for the helpful feedback.


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Re: First images with our new Ha set up 29 July 2022

Post by marktownley »

I think the tuning is pretty spot on given the first image you posted below the scope pic.


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Re: First images with our new Ha set up 29 July 2022

Post by Oak »

I agree the tuning looks good, and will defer to more experienced folks on that. I'm just curious really. I believe that the mica etalons will red-shift the central wavelength with increasing f ratio, but maybe that effect is small enough to be neglected in this setting. My quarks etalon is on-band at the zero setting (measured by hydrogen lamp), but I need to go to +4 when I use it in my f7 scope.

For tuning, one is supposed to find the setting with the darkest filaments and brightest plage.


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Re: First images with our new Ha set up 29 July 2022

Post by Averton »

Thanks Mark and Derek.
We did extensively test and tune the Quark when it was still fitted to the Solar Scout but due to planning to use the 40mm Lunt etalon on the front of it for double stacking, our original tuning was done with a 40mm aperture mask. This means that the Solar Scout was actually operating at F23.25 not its native F15. This means that the only difference going from our Solar Scout set up at F23.25 to the new set up on the 72ED at F24.36 is a pretty small change. So its likely that the tuning is pretty close to correct.


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Re: First images with our new Ha set up 29 July 2022

Post by RodAstro »

Hi Clare & Peter

That looks very nice and is performing well.
I would say try it without the Baader 35nm I find mine makes the image soft and slows the exposure times because of the loss of light through the Baader.
When you think about it the Andover blocker in the Quark is cheaper than the Baader 35nm and should be fine up to 100mm aperture so not a great saving.
If you are worried about visual the Baader will work better behind the Quark closer to the eyepiece where the glass has less of an effect.

Cheers and glad it works well Rod


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Re: First images with our new Ha set up 29 July 2022

Post by Averton »

Thanks Rod.
We actually are not using the Baader filter as the ERF, it is just a 2" ZWO IR cut filter. It doesn't appear to cut the light down greatly. We have no trouble getting short exposures. The pictures below shows the 3D printed adapter attached to an M42 40mm 2" adapter which we need on the 72ED to achieve focus with all set ups and the ZWO filter is screwed into the front of that adapter.
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