Warhen

Hi guys, I realise this is an old thread. I'm a big fan of Terry and Michael at SX, for that matter, most of the camera makers are good folks, IMO. Just to back SX up, yes- this is such a common and insignificant issue. I think almost every CCD has, or will have it. Dark lines too. 'Bad columns' are a CCD spec. used with regard to video performance only, and not what we do. Further, as stated, these aren't 'bad columns.' A single warm or hot pixel can spill its charge over in this way. I believe the pixel's 'wall' may be weak as well. To some degree, a master bias may take care of it, but it's more likely that a defect map will, and most all software such as PixInsight, MaxIm DL, etc. will provide it. The white (or black) line will be filled-in with the average value of the surrounding pixels. Bottom line, no worries! Of the millions of pixels on a CCD sensor, this is a very minor and manageable thing. While CMOS has its own issues, they seem pretty immune to either hot pixels or vertical defects. Thanks!