Whats on the red channel?

[blinky]

I took this last night - the setup was a ZS66 with the WO FF II and a modded 350d. When processing there seems to be loads of red in the middle of the image. I am not sure whats caused it??? I stacked with darks and flats, might go and redo the flats???

[Starflyer]

It looks like vignetting to me, what sort of level are you aiming for in your flats Craig?

I take mine in manual (I don't trust AV mode to give me consistent flats), I shoot 2 or 3, open them in Zoombrowser and look at the histogram, I aim to get it just over half way. I then take at least 60 flats and the same number of bias frames, this seems to work for me.

Cheers,

Ian

[blinky]

Sorted it Ian - I took the flats at ISO1600 and they should have been ISO800 - the same as the light frames!

I got hold of the 'Photoshop Astronomy' Book and am working my way through the image now - it's looking quite nice even if I do say so myself!

[Starflyer]

Nice one Craig, looking forward to seeing the end result

It's a great book, I've been playing with the grain reduction techniques over the last few days, great for keeping the noise down when you have to stretch an image that bit too far.