
But the thickness of this tail is less than required (25.5 - 18 = 7.5mm), so the Holga's focusing ring is set to the closest distance. This caused the optics to move away from the rear "sieve" aperture plate, making the vignetting more visible at infinity.

And of course the vignetting is very heavy on the full-frame sensor.
Some photos: 1.5 crop (APS-C) and full-frame images.

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