Stacking 10in F7 and F5 images

Image processing, astrometry, photometry, etc.
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Dunmunro
Posts: 225
Joined: 10 Jan 2019, 01:11

Stacking 10in F7 and F5 images

Post by Dunmunro » 13 Jan 2023, 22:12

Two 10in SCTs F5 and F7!

This image is a stack of 10 x 1200sec subs at F7 and 14 x 900sec subs at F5. I used the 'Distorsions between images' option. No flats or dark frames (how?) Both OTAs were using an Orion SSpro camera:

fabdev
Posts: 461
Joined: 03 Dec 2018, 21:43

Re: Stacking 10in F7 and F5 images

Post by fabdev » 13 Jan 2023, 23:18

It looks like the distortions from F5 and from F7 are too different, even for that option. May you post the two separate images?
Fabio.

Dunmunro
Posts: 225
Joined: 10 Jan 2019, 01:11

Re: Stacking 10in F7 and F5 images

Post by Dunmunro » 14 Jan 2023, 00:18

fabdev wrote:
13 Jan 2023, 23:18
It looks like the distortions from F5 and from F7 are too different, even for that option. May you post the two separate images?
Fabio.

I posted the separate stacked images here:

viewtopic.php?f=6&t=753

fabdev
Posts: 461
Joined: 03 Dec 2018, 21:43

Re: Stacking 10in F7 and F5 images

Post by fabdev » 14 Jan 2023, 16:53

That's interesting. Using an improved algorithm it was possible to obtain the following result: It's still not perfect (the "double stars" in the corners now look like "coma").
The correction is now included in SP4, if you like to receive the prerelease please write me by PM ore email.

Here is an animation of the distortions between these two optical systems:

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