Calibration Frames for 130GTX

Nick Iversen

I have been taking long exposure dark frames with my 130GTX covered at each end to prevent light leakage. But I just realised that I haven't been covering the gap between the tube and the dew cap. That gap is almost airtight. It doesn't leak light does it? I will cover it from now on however.

Speaking of calibration I have seen it said that for flats you don't have to cool the camera because exposure is too short. That surely can't be right for CMOS can it? I always cool my camera for flats.

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