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batema
16-05-2016, 05:28 PM
Hi,

This image consists of 10 hours and 10 minutes of data capturing 4 hours and 30 minutes of luminance data and approximately 2 hours of red, green and blue data.

Hi resolution image can be found here: https://www.flickr.com/photos/134809098@N04/27045500635/in/dateposted-public/

Telescope: Tec 140mm
Mount: Astrophysics 100
Camera: SBIG STT 8300M

I have over 20 hours of data but after I stacked over 10 hours worth of luminance using Deep Sky Stacker I went through and eliminated the worst subs and then stacked my 4 hours and 30 minute and the stars were less bloated and the galaxy was sharper but maybe that is wrong or right I don't know.

Comments welcome.

Mark

alpal
16-05-2016, 06:37 PM
Hi Mark,
Nice pic & maybe better conditions would have made it better?

you pic here of Eta Carinae is so sharp:
https://www.flickr.com/photos/134809098@N04/26311697212/in/dateposted-public/

yet M83 is not.
It must have been the seeing conditions.
Did you measure the FWHM of each frame as you waited for the next one?


cheers
Allan

batema
16-05-2016, 06:52 PM
From memory the fwhm as shown on deep sky stacker was between 5 and 8 I think. Not really happy with it but maybe there was some contribution of the seeing as opposed to my ability to stuff up the processing.

alpal
16-05-2016, 07:11 PM
5 & 8 is no good.
It's not worth doing 10 hours unless it's down to 3.5 FWHM or below

rustigsmed
17-05-2016, 02:25 PM
smooth as Mark but sounds like the seeing may have let you down a tad. never mind the colour data would still be useable when conditions fine up concentrate on the L.

cheers

russ

Atmos
17-05-2016, 11:22 PM
Still looks pretty good Mark. As has been suggested, if you can get better seeing for your Lum it'll make all the difference :)
Also looks like you could push the saturation more but that is arguably a personal taste thing... I like bold :P