unguided galaxies

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unguided galaxies

Post by numchuck » Wed Apr 03, 2019 6:30 pm

Hey All , here is M65/66 . I took this January 5th from my work place parking lot in Boerne , Texas , with a QHY183m cmos and an ES127 FCD100 on an unguided CGX mount : 600 frames , each of 6 seconds . Thanks for looking .

https://drive.google.com/file/d/1Hw9h9Q ... p=drivesdk
Last edited by numchuck on Tue Apr 30, 2019 12:53 pm, edited 4 times in total.

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Re: unguided galaxies

Post by oopfan » Wed Apr 03, 2019 7:05 pm


There is a lot of nebulosity that we are not seeing because you have the black level set too high -- that is why outer space is black. Can you reprocess it so that we can see space as a shade of gray?


PS: What's worse: the sky glow from San Antonio or Austin?

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Re: unguided galaxies

Post by BlackWikkett » Wed Apr 03, 2019 9:57 pm

Agree with Brian. There's a lot of detail you are missing from too high black point. The cores have lots of details and your stars are round to the edges. Well done!

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Re: unguided galaxies

Post by roelb » Thu Apr 04, 2019 12:29 am

Celestron Nexstar Evolution 8 - Celestron Nexstar 6 SE - OTA 5 SE - StarSense
Starlight Xpress Lodestar X2 Mono -- ZWO ASI290MM -- ZWO ASI224MC -- ZWO ASI533MC-Pro

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Re: unguided galaxies

Post by numchuck » Fri Apr 05, 2019 2:12 am

Okay Brian , I tried to keep more of the galaxy's edge in tact ; but now you can see the mistakes I was hiding .

https://drive.google.com/file/d/1Z-G82i ... p=drivesdk

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Re: unguided galaxies

Post by RMSQueenMary » Thu Apr 25, 2019 12:09 am

Looks good. 8-)

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Re: unguided galaxies

Post by donstim » Thu May 02, 2019 3:33 am

Is there something that can be done to remove the artifact at the bottom of the photo other than clipping the black level? That's a tough trade to have to make, and I can see why you did what you did in the first photo.

By the way, I believe that outer space is indeed black. It is not gray. It is only the effect of our atmosphere that keeps outer space from being black from our perspective.

Don S.

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Re: unguided galaxies

Post by turfpit » Thu May 02, 2019 6:39 am

Some interesting articles on the colour of the night sky and space here:

http://www.clarkvision.com/articles/col ... night.sky/

http://www.clarkvision.com/articles/col ... llar.dust/

There is more information on Roger Clark's web site.


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