Pentax smc FA 43 mm f/1.9 Limited
8. Vignetting
At the maximum relative aperture the brightness loss in the frame corners amounts to 24% (-0.80 EV) and it is the only place where we can notice it at all. On stopping down to f/2.8 we can make the problem disappear completely because then this aberration reaches 8% (-0.23 EV).
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You must remember, though, that the Pentax 1.9/43 is a full frame lens and its real vignetting test should have been conducted on full frame. Unfortunately we didn’t have an opportunity to perform such a test.
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