Colourful M20

[billdan]

Did 4 hours on the Triffid on Monday night, had a hard time with flats over correcting. Eventually I had to add an offset of 10,000 ADU to the masterflat to make it work correctly.

Cheers
Bill

[Slawomir]

Very colourful indeed!

Nice work Bill, I particularly like the stars in your photo :thumbsup:


Interesting about adding an offset to the master flat - I have not thought about that. In the past I used to aim for about 20,000ADU in my flats and that was insufficient for proper correction, so now I try to get my flats around 30,000ADU mark, however, as high as 40,000ADU still works well (although the sensor is non linear at that stage).

[billdan]

Thanks Suavi,

My average for the masterflat was 30,000 ADU (max 39,000) but it over-corrected, with trial and error I needed 10,000 added on to the 30,000 for it to work properly.
Pain in the neck having to re-stack 50 subs for each iteration I tried,

Cheers
Bill

[Retrograde]

Colourful yes and quite deep. I like it a lot.

[Atmos]

Very nice Bill! It certainly is quite colourful :) Quite a lot of detail in there and it a looks sharp.
Turned my telescope to this region only 10 minutes ago :P

[strongmanmike]

Wow, looki that! very striking and colourful, make a great Christmas card I recon Bill :thumbsup:

Mike

[multiweb]

Very nice colours. I like the framing too. :thumbsup:

[billdan]

Thank you all for the nice comments, Mike I know a lady that lives nearby that produces Xmas cards, I might go and show her my pics and see what she says.

Cheers
Bill

P.S. Sorry for bumping this thread back up to the top.