Thread: 4" focusers, enormous imaging circles
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Old 13-10-2020, 12:49 PM
Emuhead (Andrew)
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Join Date: Oct 2019
Location: Melbourne, Australia
Posts: 221
..and what size filter would this need to not have vignetting? Biggest Astrodon 3nm i found is 65 x 65mm for 'only' 2500USD each. But i take your point on reducers, that could be beneficial.
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