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To put things in perspective I have attached some photos from Sky and Telescope in 1997 (20 years ago).
The first is a typical pixel planner for planetary or DSO imaging, and the second the difference in quality of large pixels on DSO images.
How things have changed with respect to cameras, as 9 micron is about the largest you can buy today and the average around 5 micron, with the newest cameras at 3 micron or less.
Cheers
Bill
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