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In the case of the Gr III or other small cameras, the frame can be as small as the front of the lens itself. This is particularly the case if the lens is a fixed focal length. Take a look - that NiSi is tiny.
Not tiny, though, are the filters - they are full-size in relation to the front element of the lens and there'll be no vignetting. No degradation of the image quality, either - these are premium coated filters. You'll note that you can control glare with the polariser, tone down overblown skies with the graduated ND, or drop the shutter speed dramatically with the 3 X all over ND filter. Not so sure what they " Natural Night " one means but the literature says it stops light pollution for long exposure star shots.
If I could stay awake after 10:00PM I'd be able to tell you whether it works...