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Sky quality with a DSLR ? added graph


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This site is interesting
Briefly : he derives m/sq thingy by the length of exp needed to get the histogram (in a jpg not  a  raw) to 50%. He  says the method was calibrated at a dark site but the calibrating device is not specified (or I missed it !)

I wonder if anyone with a sky quality meter has evaluated this or similar camera type measures?

Reason for my interest :
Until now I have relied upon Mk1 eyeball to know how good the night is. However it seems a long time since I saw, unaided, the Andromeda Galaxy or the Rift in the Milky Way. Is it my old eyes or global warming ?!

Also, after playing with fixed cameras on a tripod, my thoughts are turning to a tracking device and sub lengths.


Edited by Malpi12
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15 minutes ago, ONIKKINEN said:

 ASTAP, platesolve it 

 Thanks, yes I tried that but but never got  it to work, even giving it an accurate, rather than approx. location, - still "unsolved" :( so either it does not  like my non-round stars or I am doing something stupid ! I think I got the cats. downloaded, but perhaps not correctly !  I'll try again with some nice bright stars and shorter exp. , , 

Meanwhile,  any chance someone with a dslr, and meter +/- ASTAP. could try the 50% histo method :) 

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  • Malpi12 changed the title to Sky quality with a DSLR ? added graph

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