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1x1 for luminance and 2x2 for colour has been my most used approach. Its the most time effective and little downside.
I do use 1x1 for everything for galaxies when I want detail. But even there if time is a constraint I go for 2x2 on rgb.
If the seeing is good then 1x1 everything makes sense. Seeing is a great evener.
Small pixels like in 694 sensor make 2x2 practical at times especially for narrowband unless it great seeing again.
Very often the practical limit on our imaging is available time given how infrequently clear skies occur on no moon nights around major cities.
So anything that gets higher SNR in less time like more sensitive cameras, faster scopes makes a lot of sense.
Greg.
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