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This topic is well covered elsewhere...but the solution is in the description
i.e. we want to maxmize signal, and mininize noise.
The first thing you can do is shoot under a dark sky, and only when the seeing is great.
Then it comes down to instrumentation pure and simple.
More signal comes from:
larger apeture
higher quality optics
better tracking
better guiding
higher sensor QE
Less noise comes from:
low noise sensor design
perfecting image calibration
cooling the sensor
high quality optics
optimised readout electronics
just my 2 cents worth.....
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