[Joshua Bunn (Joshua)]

Originally Posted by LewisM

but manageable, yet time consuming in CCDStack.

I use ccdstack for my stl11000, so I guess i should try it, thanks Lewis.

Originally Posted by Shiraz

do you think it could be fixed pattern noise (eg from darks or flats) being smeared out by guiding drift?

Dont know Ray, I might do some research on that.

Originally Posted by Shiraz

If it is FPN, solution is to dither while gathering images - if it is getting in through the dark, could possibly help to get more dark data...

I guess these images were "dithered" between frames as there was a little polar alignment drift.

Originally Posted by Alchemy

Try debayering your images using the proprietary software that came with the camera convert them to a 16 bit TIFF then stack, that way DSS doesn't have to do any debayer work, as per last comment more darks should improve things, if your still getting noisy images just try stacking with median combine.

Thankyou Alchemy. Ill look into that.

Originally Posted by jjjnettie

I get that too at times. I find it happens when the evening humidity and temperature are high.
It's a right nuisance. No amount of darks (taken at the same temp) helped. Someone suggested dithering, that didn't help either.
In the end I caved and bought a cooled DSLR and only use my stock DSLR for long exposure work when the ambient temp is below 10C.

Thanks for sharing your experience