[mldee (Mike)]

Originally Posted by RickS

Are you binning? The KAF8300 can generate short horizontal blooms due to the limited depth of the horizontal shift register. Examples here: http://www.pbase.com/wjshaheen/horiz...he_kaf8300_ccd

Cheers,
Rick.

Yep, exactly like that, and it would be caused by the fact that Neb by default uses 4x4 binning in the focus mode. I can change that to no binning and will check again. Clouds permitting.....

The blooming actually starts out as short horizontal lines that gradually merge into the "bloom". Interestingly, the little star image in the fine focus window doesn't seem to bloom.

Does this mean that binning is a no-no for RGB in actual imaging, rather than focus mode?