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Andromeda Galaxy - Askar ACL200 Lens

Astrophotography CMOS
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#1 Jim Waters

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Posted 06 December 2023 - 04:49 PM

This is the first real image taken with my Askar ACL200 lens at f/4 from my backyard (Bortle 8.5) using my ASI2600MC Pro set to -10c.  Three hundred and seven, 30 second Light subs including Darks, BIAS and Flats.  No light pollution filters were used.  I originally took 400 subs but had to toss 97 due to clouds.

 

This is my second ACL200 lens.  The first had noticeable astigmatism on one side and I returned it.  I also used the Askar EAF backet so I could auto-focus the lens.  I had major issues with this bracket and had to work around the problem using NINA 3.0.  When the EAF motor does focusing steps the torque was enough to pull the lens left or right.  I couldn't fix this problem.  I had to disable auto-guiding and put in a 4 second pause after each focusing run using NINA.  The DEC spikes were around 50" peak-to-peak.  RA was around 25.  My CN post on this problem is below.

 

https://www.cloudyni...ght-and-issues/

 

 

Compressed JPEG.  I may add more subs later.  C&C welcome.

 

53380038126_e67ca52091_b.jpgAndromeda Galaxy  - Backyard by Jim Waters, on Flickr

 

 


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#2 descott12

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Posted 06 December 2023 - 04:50 PM

Beautiful image. I really like the wide-angle view. Perfect color.


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#3 rgsalinger

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Posted 06 December 2023 - 04:57 PM

Has a nice 3d feel that I didn't get with the shot I took a month ago. Very nice. 

 

Rgrds-Ross


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#4 danny1976

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Posted 06 December 2023 - 05:08 PM

Your stars seem to be in perfect shape.


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#5 Oddyse

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Posted 06 December 2023 - 05:13 PM

I love it! A nice perspective and rendering of Andromeda.
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#6 Jim45157

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Posted 06 December 2023 - 06:48 PM

GREAT


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#7 david.shadrach

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Posted 07 December 2023 - 01:11 AM

Terrific shot. Well done Jim.


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#8 Jim Waters

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Posted 07 December 2023 - 01:49 AM

Thanks all.



#9 Kevin_A

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Posted 07 December 2023 - 10:42 AM

Jim, 

it looks like you got a keeper on the second lens for sure. 
Very nice colors and depth for a 50mm aperture lens at f4 and 30s subs… wow! 

Impressive to say the least!

Looks great and hopefully you can find a way to tame the EAF torque beast!


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#10 johnd39818

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Posted 07 December 2023 - 08:48 PM

Very nice!
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#11 Juno18

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Posted 08 December 2023 - 06:56 AM

Beautiful image Jim!

 

I really love the fov. Wide fields really give a great perspective. 
 

I just bought a Samyang 135 F2 and will start experimenting with it after the new year. 
The lens is wonderfully sharp for regular photography and I’m hoping that I don’t have too many issues with setup.

 

Well done!


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