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Hi, thank you for the reply.
Actually I’m looking for 700 – 1000 nm, to avoid light scattering (to photograph stars during daylight).
Yes I read about the IR filter, and I just rechecked it – seems a bit complex, but if it has to be done, it will be done.
The pictures will be used for calculating distances between stars, thus high resolution is necessary. The leakage errors should not be a problem since a computer will do all the work.
Is there a way to calculate how low must the shutter speed be to register a star of a given magnitude – the star should register as at least 5 pixels in diameter (at this the constituting pixels should be at least 2 times brighter than noise)? If possible I’d like to calculate this before I buy the actual camera – I know speeds depend on the sensor, but I’d like to make at least an estimate.
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