Jump to content

sgl_imaging_challenge_2021_annual.thumb.jpg.3fc34f695a81b16210333189a3162ac7.jpg

Only 15 minutes of data on NGC 7822


lensman57
 Share

Recommended Posts

Hi,

Taken a couple of nights ago in the hope of an Ha RGB image. Only 3 subs of 5 minutes each in Red before the clouds arrived. I didn't even bother to take the flats. A very noisy image indeed. Processed mostly in PI.

Quattro 8s, Atik 383L and an Ascension 1.25" Red filter. What I could do with 6 hours of clear night and no Mr Moon.

Thanks for looking and feel free to slate it , I would.

post-28808-0-29953500-1413220652_thumb.p

  • Like 9
Link to comment
Share on other sites

Lovely image, only thing that doesnt look quite right is the corners of your image. Not sure whether it just needs cropping or if you have picked up the scope. I am sure someone far more intelligent than me will be able to clarify :grin:

Link to comment
Share on other sites

Lovely image, only thing that doesnt look quite right is the corners of your image. Not sure whether it just needs cropping or if you have picked up the scope. I am sure someone far more intelligent than me will be able to clarify :grin:

I didn't take any flats and I was using 1.25" filter with the large KAF 8300 chip so some clipping at the edges is expected, no way I can afford the 2" filters . Thank you for your words.

A.G

Link to comment
Share on other sites

Your starfield looks reasonably good (decent corners). But I can see the tell-tale signs that the 1.25" filter is clipping your light cone. You will find that flats will not fix the dark corners (in fact it makes them look worse!) - I ended up just cropping the image when using 1.25". If youre at f4, its going to be a case of bigger filters im afraid!

Link to comment
Share on other sites

Your starfield looks reasonably good (decent corners). But I can see the tell-tale signs that the 1.25" filter is clipping your light cone. You will find that flats will not fix the dark corners (in fact it makes them look worse!) - I ended up just cropping the image when using 1.25". If youre at f4, its going to be a case of bigger filters im afraid!

I agree, infact I am @ f3.6 and no flats were take taken.

A.G

Link to comment
Share on other sites

There's an intermediate filter size (can't remember exactly how many mm) from Baader just for this chip. Smaller than the mortgage 2 inch blighters, anyway. I speak as a victim!

Olly

Hi Olly,

There is a set of unmounted 36mm Baader LRGB filters from FLO @ £239.00 which is " tolerable " but then I have to change the FW which is not possible at the moment.

Regards,

A.G

Link to comment
Share on other sites

Your starfield looks reasonably good (decent corners). But I can see the tell-tale signs that the 1.25" filter is clipping your light cone. You will find that flats will not fix the dark corners (in fact it makes them look worse!) - I ended up just cropping the image when using 1.25". If youre at f4, its going to be a case of bigger filters im afraid!

I attach a flat with the same set up ( Quattro 8s @ F3.6, 1.25" filter, Atik 383L+)  taken using a very diffused light from a flat panel ( Gerd Neuman ) I have applied a simple stretch in PI with STF parameters , there are stll some issues with regards to even illumination that need to be resolved but I be grateful for any advice.

Regards,

A.G

post-28808-0-22708100-1413496495_thumb.j

Edited by lensman57
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

  • 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.