Jump to content


help with M82 please

Recommended Posts


I had a good stab at M82 on Friday, taking 23 subs of 5mins each, Mod'd Canon 1000d, CLS filter, C80-ED, auto-guided on HEQ5. I focused using the bahtinov mask and checked it using liveview without the mask. I took darks and flats and processed in DSS and Photoshop. However, my result is noisy, lacking in colour (the nice blues and browns) and lacking in detail, particularly when compared with this one by Uranium325, which is only 15x3min subs-

http://stargazerslounge.com/imaging-deep-sky/101979-first-light-w-1000d-m81-m3.html. Mine doesn't have any where near the same number of stars coming through either.

So, where am I going wrong? Is it just that my frac is F7.5 vs F5 of the 150p? I have tried this target with a C8 SCT at f6.3 too, but still haven't acheived this level of detail. Could the CLS filter be taking away too much, perhaps the Skywatcher LP filter would be better?

I've also attached a cropped TIF from straight after stacking.

Thanks for any help.

ps. Uranium325 if you read this, I'd love to know your secret!!


bodes avg 23 subs cropped after stack.tif

Edited by sgazer
Link to comment
Share on other sites

Interesting. I was imaging the same from the Midlands that night and gave up. I usually get a really good image on M82 no problem but this time I can only assume there was high thin cloud or ash about. My image was, diffuse, washed out, lacking in colour. At one point I began to think that the camera had packed up.

Link to comment
Share on other sites

Thanks Glider, yes interesting indeed. Perhaps it was the seeing conditions then. This is the first time I've done more than about 9 subs on M82, I was hoping for so much more. I think the length of the subs and quantity should have made up for a relatively slow scope.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.