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According to Zwo when using their EFW "The distance between the filter and sensor is around 10mm when you connect it to ASI1600.
So 1.25″ filters won’t have vignetting up to F5 focal ratio scope and 31mm filter won’t have vignetting up to F2 lens". So I imagine you should be safe going for 1.25" filters with the 183mm's smaller sensor even if you pick up a reducer later.
edit: This is the the equation for calculating vignetting
Filter distance from sensor / Filter clear aperture - sensor diagonal (26mm for 1.25, 28mm for 31mm)
10mm/(26-15.9) = F0.9 Vignette ratio
Last edited by sunslayr; 10-08-2020 at 05:28 PM.
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