first test shot solex and AT115 apo

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first test shot solex and AT115 apo

Post by highfnum »

this is my largest scope with this SHG
so far

805mm FL
some high clouds
Capture 2023-05-13T11_17_46at115ha1_shift=0_claheJsdl.jpg
Capture 2023-05-13T11_17_46at115ha1_shift=0_claheJsdl.jpg (172.39 KiB) Viewed 1833 times
Capture 2023-05-13T11_17_46at115ha1_shift=0_diskHCJsdl.jpg
Capture 2023-05-13T11_17_46at115ha1_shift=0_diskHCJsdl.jpg (149.22 KiB) Viewed 1833 times


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Re: first test shot solex and AT115 apo

Post by rsfoto »

Superb images.

Why do I not get that quality? :cry: :cry: :cry: :cry:


regards Rainer

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Re: first test shot solex and AT115 apo

Post by highfnum »

is collminator focused to slit?


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Re: first test shot solex and AT115 apo

Post by rsfoto »

highfnum wrote: Sat May 13, 2023 6:37 pm is collminator focused to slit?
As far as I know yes.


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Re: first test shot solex and AT115 apo

Post by rsfoto »

Hi,

I just made a test looking at 0 order and defocusing the telescope and the slit shape did not change. The camera is focused on the slit.

Below some images of my slit and you can see the shape does not change. The slit width is ~4pixels in the image. The camera ASI 178MM has a pixel size of 2.4µm. So my slit image is about 4.8µm. The slit is a 10µm slit.

Telescope focus set at 9880 steps
Sol'Ex_slit_Focus_2_NHSA.JPG
Sol'Ex_slit_Focus_2_NHSA.JPG (41.16 KiB) Viewed 1806 times

Telscope focus set at 14880 steps
Sol'Ex_slit_Focus_3_NHSA.JPG
Sol'Ex_slit_Focus_3_NHSA.JPG (37.74 KiB) Viewed 1806 times

Slit resized 3200%
Sol'Ex_slit_Focus_4_NHSA.JPG
Sol'Ex_slit_Focus_4_NHSA.JPG (239.16 KiB) Viewed 1806 times


regards Rainer

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Re: first test shot solex and AT115 apo

Post by rsfoto »

Hi,

I just made some other tests

Original image size and then resized to the same size as yours.

20230513_discHC_Ha_15_52_23.jpg
20230513_discHC_Ha_15_52_23.jpg (722.66 KiB) Viewed 1800 times

Top your image, middle and bottom (applied some sharpening in PS CS) my image.

Comparison
Comparison_SHG_13052023.jpg
Comparison_SHG_13052023.jpg (403.05 KiB) Viewed 1800 times


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Re: first test shot solex and AT115 apo

Post by highfnum »

your slit focus image looks better than mine!
your images show same items just slightly out of focus

do you make sure edge of sun beam is razor sharp?
before you take sequence?

what is imaging scope
what is objective scope?


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Re: first test shot solex and AT115 apo

Post by highfnum »

your bottom image is very close


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Re: first test shot solex and AT115 apo

Post by rsfoto »

highfnum wrote: Sat May 13, 2023 11:29 pm your slit focus image looks better than mine!
your images show same items just slightly out of focus

do you make sure edge of sun beam is razor sharp?
before you take sequence?

what is imaging scope
what is objective scope?
1. Thank you

3. Yes, as good as possible. I think I need to work on that.

4. 60mm f/6 stopped down to f/10 Astromania finder scope

¿objective scope?

The optical is original Shelyak for Sol'Ex and Star'Ex version

BTW. I can not scan at 16X so I scan at 1x with 14 frames per second. That is the only way I get round Sun's.

Where are you located?

Rainer


regards Rainer

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Re: first test shot solex and AT115 apo

Post by Merlin66 »

Rainer,
Your zero order testing.
This will not show any impact of the telescope out of focus on your SHG.
The slit is being flooded by the solar image independent of the telescope focus.
It does show that your collimator is close to focus position.


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Re: first test shot solex and AT115 apo

Post by highfnum »

The lovely Hudson valley area upstate NY

what software are you using to build image?
I am using asi178mm camera.


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Re: first test shot solex and AT115 apo

Post by ChrisHalpha2017 »

hello,

just WOAW!! that is really some great results!!! That motivates me to try too :)

very nice!!


spectro-coronographe ,Bresser 127/1200 ; Bresser 102/1350 , ASI 178MM
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Re: first test shot solex and AT115 apo

Post by rsfoto »

Merlin66 wrote: Sun May 14, 2023 12:39 am Rainer,
Your zero order testing.
This will not show any impact of the telescope out of focus on your SHG.
The slit is being flooded by the solar image independent of the telescope focus.
It does show that your collimator is close to focus position.
Hi Ken,

So my slit is not yet well focused ?


regards Rainer

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Re: first test shot solex and AT115 apo

Post by highfnum »

today at115 with 250mm focal reducer
Capture 2023-05-14T16_24_16AT115F15A_shift=0_claheJs-Ds.jpg
Capture 2023-05-14T16_24_16AT115F15A_shift=0_claheJs-Ds.jpg (295.35 KiB) Viewed 1713 times
Capture 2023-05-14T16_24_16AT115F15A_shift=0_diskHCJs-Ds.jpg
Capture 2023-05-14T16_24_16AT115F15A_shift=0_diskHCJs-Ds.jpg (260.99 KiB) Viewed 1713 times


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Re: first test shot solex and AT115 apo

Post by Merlin66 »

Rainer,
Looks more like the telescope focus is a little off rather than the collimator.
Try to get a tighter edge on the top/bottom of the spectral image.


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Re: first test shot solex and AT115 apo

Post by Montana »

These are fabulous :bow :hamster:

Alexandra


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Re: first test shot solex and AT115 apo

Post by rsfoto »

Merlin66 wrote: Mon May 15, 2023 12:05 am Rainer,
Looks more like the telescope focus is a little off rather than the collimator.
Try to get a tighter edge on the top/bottom of the spectral image.
" ... tighter edge ... "

Do you mean the to make the ROI smaller ? I am already at a Roi between 2000 x 90 and 2000 x 60 ...

... or concentrate on the left and right edge ?

I focus the camera on small horizontal lines and then I focus the scope as good as possible.

I think I will get a 70mm diameter and 400 mm focal length scope.

Rainer


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Re: first test shot solex and AT115 apo

Post by Merlin66 »

Rainer,
Start with the focus of left and right edge then any vertical lines and finally the wiggles in and on the absorption line.
Ken


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Re: first test shot solex and AT115 apo

Post by PDB »

I think I will get a 70mm diameter and 400 mm focal length scope.
I would NOT do that before you get the results you are after. Work on your focus.
The more the focal length of the scope comes closer to ~420mm the more difficult it will get to make the scans. If the solar image just fits in the slit (4.5mm) length, you will have to be very precise in making adjustments to the horizontal scan (and keep a full disc on the result). Ken's SimSpec will tell the exact sizes of the Sun per month.

Zoom in to te ROI (even 200%) to see the edges and the wiggling line. As already said a few times, the more it wiggles the better.

Once you master that, it's time for a better scope.

Paul


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