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Neat little project!
If you're desperate for recording more photons and accurate tracking is an issue (prohibiting longish exposures due to trailing) then there's a technique called binning that will trade off resolution for exposure and/or noise reduction.
The idea is that you create a more accurate 'super pixel' from sampling several smaller pixels. Dedicated CCDs usually have a 2x2 binning mode at the hardware level, but the same (minus CCD read noise benefits) is achievable in software.
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