Leo Triplet....

[paul mc c]

Just under an hour or 180 sec subs,with questionable flats ans dark flats,just cant seem to get flats to work right,but will hopefully work it out.

102 ed,533mc.

[rickwayne]

Looks nice! Definitely some blue gradient still going on there. Have you tried stretching one of your flats to see what it looks like? What are you using to calibrate and stack?

[paul mc c]

I'm using APP, where would I stretch one of the flats. 

[scotty38]

16 minutes ago, paul mc c said:

I'm using APP, where would I stretch one of the flats. 

Just load the file, double click it in the file list at the bottom and then check the "stretch" box on the right hand side if not already selected.

Edited February 24, 2022 by scotty38

[paul mc c]

24 minutes ago, scotty38 said:

Just load the file, double click it in the file list at the bottom and then check the "stretch" box on the right hand side if not already selected.

Will check that out, have the laptop imaging atm. 

[rickwayne]

Don't be afraid to use the 2-sigma stretch -- it uglifies things, but points up problems nicely. In fact I use it all the time to identify gradients and such. I never save an image that way -- blecch! -- but it's a very useful tool. 

[paul mc c]

2 minutes ago, rickwayne said:

Don't be afraid to use the 2-sigma stretch -- it uglifies things, but points up problems nicely. In fact I use it all the time to identify gradients and such. I never save an image that way -- blecch! -- but it's a very useful tool. 

Is this in APP.? 

[rickwayne]

Yes. In general, though, it's a technique to use in any astro program that can apply stretches and such in a preview without changing the underlying linear data. Siril, for example.