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thanks for feedback Alistair - sorry I misunderstood the basis for your questions. If you want to understand the underlying maths for the method, have a look at the Starizona/Smith stuff, but instead of solving for exposure time, it has been solved to provide a target ADU level.
Re binning, there are many unknowns in the ways the chip makers implement the process. Am coming to the conclusion that the best way may be to expose at 1x1 for colour and then bin in software if you want to get better SNR in the colour (at the expense of colour resolution). If you use the targetADU method for keeping the read noise insignificant, you should get just as much SNR advantage as hardware binning (probably more) and get 4x better dynamic range to keep the bright star colours.
regards ray
Last edited by Shiraz; 07-02-2014 at 02:00 PM.
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