Comparison 
(Click to enlarge) This image © Copyright 2018, Michael Fulbright Comparison of vignetting with a 31mm unmounted vs a 1.25 inch mounted filter.ASI1600MM-Cool/ZWO EFW-8/Astrodon unmounted 31mm Ha (5nm)/Baader L 1.25 inch mounted Date: 04/04/2017
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