Under sampling images are certainly a great way to be able to ignore objective PE error numbers. The lost detail is not and cannot observed due to having huge circles of confusion and soft images that if you stand far enough back from look okay.?
The current DSO best practices seem to be a sample rate that is 2.5 times better than atmospheric. This is coming down from the best planetary imagers in the world using lucky imaging techniques which oversample at even higher rates and may be trending up.?
This requires objective knowledge about a mount's error rate. I learned this back in my studio days shooting cut sheet 4x5 macros from a 25 pound tripod that had to be reshot. I used a 400 pound camera stand for second session and the job was accepted.?
Just saying.?
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Chip Louie - Chief Daydreamer Imagination Hardware
Chip Louie