Hello,
I have three things that have been bugging me and I don't know the reason for...
1/ taking bias frames the other day with the newt capped. A towel over the end and black tape over the finder of the DSLR I noticed a very subtle grey area top of the frame that looks like a light leak (it was daylight) but I don't know where its coming from.
I will check dark frames and bias frames done at night for this at the weekend.
2/ using a light box for flats on my SV 60 (+ 1000D) scope a get a nice thin peak on the histogram in APT, using another light box with my 60Da on the newt I get a double peaked histogram in all the histo's, why?
3/ what's an average exposure length for iso 800 light box flats?
Using APT I tend to let it set the exposure using AV and the flats setting, but if I do it manually I have to use minuscule i.e 0.01 sec exposures to get the histogram looking right, and still I am not convinced either of them are correcting properly
Cheers
Curious Graham
