Quote:
Originally Posted by OneCosmos
Hi Alex,
Thanks for the comprehensive response, although now a moot point because I did go full frame, mainly because a good deal on IIS came up and I took it. I do however only have 2" round mounted filters and it now sounds like that might cause me some grief. Down the line I suppose I can swap them out if I feel it is necessary.
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Hi Chris,
I think you'll be OK.... barely/JUST, with 2 inch filters on a Fullframe sensor. If your camera is genuinely full frame at 36mm x 24mm, and not one of the larger 36x36mm cameras, then it has a 43.27mm diagonal.
As a guide, the screw-in 2 inch filters I have are M48 threaded and have a clear aperture diameter of 44mm which just exceeds the full frame sensor diagonal of 43.27mm, meaning that the filter should not restrict the illumination of the sensor, if properly centered/aligned. If anything it's more likely that the telescope optics might not fully or evenly illuminate the sensor. You can get a feel for the
true image circle diameter by testing by projecting a daytime image at infinity (easier) on to a sheet at the focal plane and measuring the diameter of the illuminated circle. You can also get a feeling of image fall-off and distortion at the edges in so doing.
Best
JA