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Askar ACL200, NGC7000, Astromania H Alpha 12nm

DSLR Filters Astrophotography DSO Cassegrain
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#1 KLWalsh

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Posted 22 October 2021 - 05:06 PM

For all of the years I’ve been doing astrophotography, I hadn’t done much narrowband imaging.

I recently got an Askar 50 mm, f/4 lens, 200 mm focal length, astro lens and thought I’d use it to try some narrowband imaging.

Here’s a 2h, 20min exposure of NGC7000 at ISO 800 using an Astromania 12 nm Hydrogen Alpha filter installed in the ACL200, with a full spectrum modified Nikon D5100 attached.

The lens & camera were mounted to my RC8, mounted on my CGEM.

Software control via BYN, PHD2, and ASCOM. 
Post processing was done in PS Elements 11.

Resolution greatly reduced here from the original. Also, slightly cropped.

 

I’m liking this Askar lens. 
 

 

Attached Thumbnails

  • 63AD4297-8248-4973-B510-01984611EFFC.jpeg

Edited by KLWalsh, 22 October 2021 - 05:07 PM.

  • petert913, B 26354, DubbelDerp and 2 others like this

#2 DubbelDerp

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Posted 22 October 2021 - 05:14 PM

Nice! I love the way H-a filters push the stars into the background. Did you do any star reduction or did it just come out like that? How long of subs did you have to take?

#3 KLWalsh

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Posted 22 October 2021 - 06:32 PM

DubbelDerp -
The subs were 3 minutes long.
Aside from stretching the gray shade and tweaking contrast a bit - not all that much really - I didn’t do much post processing.
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Also tagged with one or more of these keywords: DSLR, Filters, Astrophotography, DSO, Cassegrain



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