Your OSC's Bayer matrix allocates 2 green samples vs just 1 red and blue sample to each 2x2 patch on the sensor. The green channel is therefore the best channel to record/process if you absolutely have to and really cannot live with the other channels being slightly out of focus. There are other means to mitigate chromatic aberration however (hardware and software).F-Astro wrote: ↑Wed Sep 23, 2020 3:51 pm If I wanted to create a purely mono image with my OSC, which RGB channel would you suggest processing? I assume that by processing a single channel it would eliminate the focus/wavelength issues discussed above, creating a sharper image than a full color image converted to black and white?
Of course, the green channel will only record one part of the spectrum and you will miss out on Ha and SII. That said, the latter statement isn;t enitrely true for many OSCs as green channel sensitivity goes up again (see here). To avoid recording detail at those wavelengths (which may be out of focus), use a UV/IR cut filter.
Really though, the loss of so much signal (e.g. the parts of the spectrum no longer recorded) makes all this not something that many find practical. Living with and mitigating the CA is usually the lesser of the two evils.
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