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Old 20-12-2024, 12:06 PM
TrevorW
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36mm Filters

If you have a APS-C size sensor would using 36mm filters cause any vignetting ???
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  #2  
Old 20-12-2024, 12:13 PM
Startrek (Martin)
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Trev,
Here ya go …..,

https://astronomy.tools/calculators/ccd_filter_size

Martin
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Old 20-12-2024, 01:07 PM
TrevorW
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Thanks Martin according to that calculator it should be OK
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Old 20-12-2024, 02:32 PM
Startrek (Martin)
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I use 2” unmounted filters in my ZWO 7x2 filter wheel with ZWO 2600MM and 2” filter drawer in ZWO 2600MC ( APS-C ) at 55mm BF and I have severe vignetting in both 8” and 10” Newts
Reason ?
My TS Optics GPU coma corrector shifts the focal plane by a good margin therefore at lest 20% of my field is not lit , mostly in the corners but marginally all the way around.
Vignetting is the trade off for a damn good coma corrector ( F6 to F4 ) which perfectly corrects coma to edge of field. ( cost as new $600 )
Calibrated Flats are worth gold in my imaging

Cheers
Martin
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