Sony FE 50 mm f/2.5 G
8. Vignetting
First let's check vignetting on the smaller APS-C sensor – appropriate thumbnails you can find below.
A7R III, APS-C, f/2.5 | A7R III, APS-C, f/2.8 |
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There are some chances to notice slight vignetting but only at the maximum relative aperture, where it amounts to 22% (−0.73 EV). By f/2.8 that aberration decreases to 14% (−0.43 EV), and by f/4.0 it drops to an imperceptible value of 7% (−0.21 EV).
After passing to a bigger full frame sensor there are far more problems and photos, presented below, show them very well.
A7R III, FF, f/2.5 | A7R III, FF, f/2.8 |
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A7R III, FF, f/4.0 | A7R III, FF, f/5.6 |
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In this case you have to take into account a loss of light of 55% (−2.29 EV) at the maximum relative aperture. By f/2.8 vignetting decreases to 46% (−1.80 EV), and by f/4.0 it drops to 38% (−1.37 EV). A slight decrease of this aberration is observed by f/5.6 and f/8.0 where we got, respectively, the following results: 32% (−1.11 EV) and 26% (−0.89 EV). By f/11 you see a level of about 21% (−0.67 EV), which, additionally, decreases very slightly to 17% (−0.54 EV) on stopping down the aperture to f/16.
Sony A7R III, JPEG, f/2.5 |
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