I found an interesting page on Mr Buil's Isis site...
http://www.astrosurf.com/buil/isis/noise/result.htm
His test contains 9 Atik 314L+ cameras which have a rated read noise of 4e, looking at his results ( 3.8, 3.9, 3.9, 4.0, 4.5, 4.7, 5.4, 6.7, 7.7 ) the median is 4.5 and the mean is 5.
Half of the cameras do well and a couple more within 10-20% of rated, what I would expect for lower end priced equipment.
But one third have values between 35-90+% of rated... ALMOST DOUBLE!!!
So where do Atik draw the line on quality control? Are these just cameras left in the sun to long or is buying one a bit like a lucky dip?
I was considering an Atik 320E for photometry with its 3e RN and decent dynamic range of approx 4600, but if bad luck gives a value of 6e RN it's not much of a bargain after all.
Anyone tested their camera and found themselves duped?
Justin.