Sony FE 400-800 mm f/6.3-8 G OSS
8. Vignetting
| A7R IIIa, APS-C, JPEG, 400 mm, f/6.3 | A7R IIIa, APS-C, JPEG, 400 mm, f/8.0 |
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| A7R IIIa, APS-C, JPEG, 600 mm, f/8.0 | A7R IIIa, APS-C, JPEG, 600 mm, f/11.0 |
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| A7R IIIa, APS-C, JPEG, 800 mm, f/8.0 | A7R IIIa, APS-C, JPEG, 800 mm, f/11.0 |
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In case of the smaller detector the problems are negligible. At 400 mm and the maximum relative aperture the brightness loss in frame corners amounts to just 16% (-0.50 EV) and it decreases to an imperceptible level of 6% (-0.18 EV), on stopping down the aperture to f/8.0.
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The situation improves very slightly after swapping the focal length into 600 mm. At the maximum relative aperture, already f/8.0 in this case, vignetting reaches 11% (-0.35 EV) and it decreases to just 2% (-0.06 EV), when you stop the aperture down to f/11.0.
At 800 mm focal length vignetting increases a bit again but these are slight values. By f/8.0 this aberration reaches 15% (-0.48 EV) and it decreases to just 3% (-0.08 EV) after applying f/11.0.
Now let's check vignetting on full frame – appropriate thumbnails are presented below.
| A7R IIIa, FF, JPEG, 400 mm, f/6.3 | A7R IIIa, FF, JPEG, 400 mm, f/8.0 |
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| A7R IIIa, FF, JPEG, 600 mm, f/8.0 | A7R IIIa, FF, JPEG, 600 mm, f/11.0 |
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| A7R IIIa, FF, JPEG, 800 mm, f/8.0 | A7R IIIa, FF, JPEG, 800 mm, f/11.0 |
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In case of the bigger detector the problems are more emphasized and it is quite understandable, but still you can't talk here about any serious slip-ups. At the combination of the 400 mm and f/6.3 aperture vignetting is 32% (-1.10 EV) and it decreases to 19% (-0.62 EV), after applying f/8.0. Stopping down by one additional EV step is able to reduce this aberration to an imperceptible level of 10% (-0.30 EV).
A very slight increase of vignetting is noticed at the longer end of the focal spectrum. At 600 mm and by f/8.0 the brightness loss in frame corners reaches 34% (-1.21 EV). Fortunately it decreases to 10% (-0.32 EV) by f/11.0 and to just 5% (-0.15 EV) by f/16.0.
At 800 mm and by f/8.0 this aberration reaches the highest level, approaching 37% (-1.32 EV). By f/11.0 it decreases to 16% (-0.52 EV), and by f/16.0 it becomes practically imperceptible, reaching only 5% (-0.14 EV).
| Sony A7R IIIa, 400 mm, JPEG, f/6.3 |
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| Sony A7R IIIa, 600 mm, JPEG, f/8.0 |
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| Sony A7R IIIa, 800 mm, JPEG, f/8.0 |
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