Pentax smc FA 77 mm f/1.8 Limited
8. Vignetting
Before we find out how it fared in reality let’s remind ourselves that the Nikkor 1.8/85 performed very well here, with the light fall-off in the corners of only 15%. The Canon was a bit worse with the result of 22%. The Pentax’s performance is similar to that of the Canon as it loses 22% of light (-0.72 EV) in the frame corners. This result doesn’t improve on stopping down to f/2.0 because the light fall-off is still 21%. Fortunately by f/2.8 the problem disappears with the marginal result of 4%.
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