[CCD-astrometry-photometry] [Aavso-photometry] SXV-H9 linearity

[BailyHill at aol.com]

Hello

BTW, when binning, be careful!!!!   When you read out and look for a 
saturated pixel, you get the sum of the 4 or 9 pixels, depending whether you are 
binning 2x2 or 3x3.

You can saturate several of the physical pixels without it showing up in the 
summed readout.

The best way to check is to not bin, check the exposure and max values, and 
then go to the binned condition for the exposures that you keep.

My personnal experience is that this effect is quite easy to overlook, it 
occurs long before you get the classic vertical lines in the images, and it 
degraded my photometry by nearly an order of magnitude.

Gary