Bodes Galaxy - M81

JimFox

Moderator
Staff member
This is of Bodes and Cigar galaxies. I was able to meet up with @Bill Richards again last night and he took me down into the dark sky site for the San Diego Astronomy Association. They have a really nice location.

And if it wasn't for Bill, I wouldn't have been able to capture this last night. It was my first time using my new astro camera, the ASI2600mc Pro. It's a color astro camera. So I had lot's of questions and Bill as always was very helpful. And then I ran into an issue getting the guiding working for the new astro mount, the Gem28 I had gotten for Christmas. Bill spent well over an hour with me at 11pm working through why it wasn't guiding correctly. Thanks to him, we got it figured out, and I was able to start guiding, which is necessary for the longer shutter speeds to keep the stars and the objects in the image nice and sharp.

So this is my first image with the new camera. It's not perfect, I have a lot more to learn, but I think it was good for a first time out with the new camera. The image is probably a bit too dark, even for my standards of liking my astro images darker, but what can I say.... it's how it ended up. :) I will probably do this one over again later and see if I can pull even more detail out of it.

This is just 2 hours of imaging. While I took darks, flats and bias frames to stack in with this. When I got back home today after being up all night with Bill last night, I got impatient and just stacked the Lights (the images) I captured by themselves just so I could check for sharpness and detail. Once I was pretty happy with that, I had processed it too much and couldn't turn back... :) So that's why I will need to try it again, but with all of the other frames we take for normal Deep Space Astro stacked into it also.

One of the things that excites me with this image is something I was never able to capture when I was using my Nikon D850 for the Deep Space Astro, and that's if you look at the spiral arms in Bodes, you will see the magenta/red areas and you can also pick out the red star forming regions in the arms. They are a bit faint, but they are there, and I think with more images on it in the future, even more of that detail would come out.

Gem28
ASI2600mc Pro
Tamron 150-600mm @ 600mm f6.3
60 Lights @ 120 secs
Bin1
Gain 50

All comments are welcome,

Jim

M81_BodesGalaxy_20220429_d1w.jpg
 

Bill Richards

Well-Known Member
Great start, Jim! Glad to be of assistance Friday night - it's always rewarding to be able to help solve problems.

Your ASI2600MC will certainly capture a lot more of the red and near-infrared than your unmodded DSLR. I had the same issue when I was using my DSLR and that was one of the two factors that drove me to a dedicated astrocam (that, and the cooled sensor).

Your instincts are correct - the image is a bit too dark which is probably also causing you to loose some of the fainter details in both galaxies. The result will be better when you stack and process properly calibrated frames.

BTW - Bias frames are mostly "old school". They were needed when a lot o the astrocams were CCDs, but with today's CMOS sensors you should be capturing Darks, Flats, and Dark Flats (not Bias frames). NINA has an excellent Flats Wizrd tool that will help you gather good Flats and Dark Flats (yes, I'm plugging again).
 

JimFox

Moderator
Staff member
Great start, Jim! Glad to be of assistance Friday night - it's always rewarding to be able to help solve problems.

Your ASI2600MC will certainly capture a lot more of the red and near-infrared than your unmodded DSLR. I had the same issue when I was using my DSLR and that was one of the two factors that drove me to a dedicated astrocam (that, and the cooled sensor).

Your instincts are correct - the image is a bit too dark which is probably also causing you to loose some of the fainter details in both galaxies. The result will be better when you stack and process properly calibrated frames.

BTW - Bias frames are mostly "old school". They were needed when a lot o the astrocams were CCDs, but with today's CMOS sensors you should be capturing Darks, Flats, and Dark Flats (not Bias frames). NINA has an excellent Flats Wizrd tool that will help you gather good Flats and Dark Flats (yes, I'm plugging again).
Thank you so much Bill.

You know? I had read something about Bias frames not being needed, so thanks for confirming that. Dark Flats I had heard of but was not sure what was meant by that term as I know what darks are and I know what flats are, so I am confused as to how they get combined. :)

I do have Nina downloaded, you convinced me that far. :)

If I use Nina, you mentioned Sequator also. There was a 3rd program I think you mentioned?

I was going to do 4 or 5 nights of the Milky Way in various locations this week, but I think Tuesday night I want to do Deep Space again. I want to build on what I learned from Friday, and also work on some muscle memory with the new gear. I don’t want to wait another month until I get out again with the new gear.
 

chuckp

Well-Known Member
Hey Jim, happy to hear you like the new camera. Your image of m81 and m82 looks great!
 

Bill Richards

Well-Known Member
These 2 videos explain calibration very well. They also answer the questions about flat darks and bias frames:

https://www.youtube....annel=AdamBlock
https://www.youtube....annel=AdamBlock

Adam Block is an astrophotogaphy post-processing legend. The videos are primarily aimed at instructing people how to use the Weighted Bacth Pre-Processing script in PixInsight, but they are instructive on image calibration nonetheless.

Bottom line - with CMOS cameras, you can never go wrong with flat darks.
 

JimFox

Moderator
Staff member
These 2 videos explain calibration very well. They also answer the questions about flat darks and bias frames:

https://www.youtube....annel=AdamBlock
https://www.youtube....annel=AdamBlock

Adam Block is an astrophotogaphy post-processing legend. The videos are primarily aimed at instructing people how to use the Weighted Bacth Pre-Processing script in PixInsight, but they are instructive on image calibration nonetheless.

Bottom line - with CMOS cameras, you can never go wrong with flat darks.
Thanks Bill for those links. I think I have heard others mention Adam Block, I will check out those videos later.
 

Mike Lewis

Staff Member
Very nice Jim! I was not aware you had pulled the trigger on a cooled astro camera - the 2600MC is an excellent performer for a OSC camera and you should do great things with it. This is an awesome start - look forward to the re-process when you utilize all the other support frames too.

ML
 

JimFox

Moderator
Staff member
Very nice Jim! I was not aware you had pulled the trigger on a cooled astro camera - the 2600MC is an excellent performer for a OSC camera and you should do great things with it. This is an awesome start - look forward to the re-process when you utilize all the other support frames too.

ML
Thanks so much Mike. The Gem28 allowed me to GoTo objects I just wasn't able to find in the sky before. Now the 2600mc Pro allows me better detail and colors then my stock DSLR. I wanted to be able to not only image objects I hadn't before, but also to take a step up in quality.
 
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