R4K Saturation Issues

Friday, June 12, 2015 11:27 AM

Problem(s) Encountered:

Saturated the CCD during sky flats in both twilight and sunrise hours, resulting in ''icicles'' of saturated pixels on the top and bottom of the CCD.

I called cleansnap several times over the course of the observing run, and seemed to clear the CCD for the more important science frames.


The R4K is very sensitive to light.  It is best to err on shorter exposures and slowly increase exposure rates from there.  Note the instructions for twilight flats here:


especially the order of filters to use, and make sure you start with a very very short exposure (e.g. 0.1s) to test the sky brightness.