Jump to content

Banner2.jpg.35fd74882a15b2b8a1b4142f7dcc8bed.jpg

M101 LRGB


robin-m
 Share

Recommended Posts

Now that I have my camera back and we've had a few clear nights M101 was an obvious one as it passes overhead at the moment

Total integration time 6 hrs 20 mins not counting subs ruined by aircraft :(

L 12 * 10 mins

R 10 * 10 mins

G 6 * 10 mins

B 10 * 10 mins

ED80 @ F7.5 no flattener. Resized 50% for posting

No darks, flats or bias frames used. I may go back and revisit the data when I've taken some but for now I'm done with it. I found M101 really difficult to process and don't feel that I've got it right yet but I'm fed up with it for now.

post-19542-0-17848900-1367609522_thumb.j

Link to comment
Share on other sites

That's very nice :) And I know the feeling :D Though I can't see anything obviously wrong with your image. I had an initial go at M101 with a relatively small amount of data, got fed up with it and took M51 next time (which wasn't much better) and then went back to M101 and collected quite a lot more data. That pretty much transformed it. It's a more difficult object than is first apparent. We need many more clear nights and could do with longer ones - 6 or 7 hours is not really that much data.

Link to comment
Share on other sites

Thank you both.

I think the reason I'm dissatisfied with it is colour. I found it very difficult to keep the galaxy colour looking natural and retain star colour. I will go back, mask the stars, and process their colour separately which may help but I've played with it for long enough now. Losing a good percentage (~20%) of your subs to aircraft doesn't help either.

One of the junked subs, a 10 min B sub just stretched.

post-19542-0-12282100-1367619470_thumb.j

Link to comment
Share on other sites

Are you sure that's not one of mine? :D I have the same problem with the dratted aircraft :( Somehow I had changed DSS stacking to "Average" instead of "Kappa-Sigma clipping". The latter will remove plane trails.

Three pics to demonstrate this :-

  1. DSS Settings
  2. A stack showing plane trails (with cropping)
  3. Another stack with KS setting with the exact same set of subs (uncropped)

post-13131-0-62029700-1367675815_thumb.p post-13131-0-82373600-1367675648_thumb.p post-13131-0-85005300-1367675707_thumb.p

Edited by Gina
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
 Share

×
×
  • 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.