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Hi guys,
An even better improvement in contrast could be had by using a series of rectangular apertures for the light baffles , sized so as to be slightly larger than the image and just big enough not to crop it, but still in the required proportion as determined by the aspect ratio, typically 3:2 for most current dslrs or even 4:3 or 1:1 for some cameras.
For a 3:2 aspect ratio sensor there would be close to a 42% reduction in stray (unusable to the image) light entering the optical system. Of course the edges of these baffles close to the edge of the image should be sufficiently far away so as not to generate any diffraction effects on the edges. This could be achieved by fine tuning.
One could even use a crude barn door arrangement (I wouldn't) to limit extraneous light.
Best
JA
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