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The deepest I’ve managed yet is low SNR at Mag 22 with 8” and dark skies in about 4 hours if luminance. That was at 1.3”/pixel. If I was to image at 2.6”/pixel it wouldn’t make much difference for a star because I was already well sampled but it would help with non-point light sources.
Capturing the same amount of photons would take 1 hour with a 16” or just under 30 minutes with a 24” or about 10 minutes with a 1m telescope.
The depth that can be achieved on dusty regions and the like can in some ways be less aperture related and more a function of aperture area and resolution. This is what makes the FSQ106 and KAF-16803 such a powerful instrument combination as Mike can attest to. Large pixels and F/5 sucks up photons and makes capturing fainter dust a breeze.
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