Tamron 24 mm f/2.8 Di III OSD M 1:2
8. Vignetting
| A7R II, APS-C, f/2.8 | A7R II, APS-C, f/4.0 |
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The aberration remains completely visible at the maximum relative aperture where it reaches 32% (−1.12 EV). It's a lot, after all we are talking about the smaller APS-C sensor. It can also be felt by f/4.0, amounting to 20% (−0.63 EV) and it becomes almost imperceptible by f/5.6, where we got a result of 13% (−0.40 EV).
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Now let's progress to full frame – appropriate thumbnails can be found below.
| A7R II, FF, f/2.8 | A7R II, FF, f/4.0 |
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| A7R II, FF, f/5.6 | A7R II, FF, f/8.0 |
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In this case the results are really bad. By f/2.8 brightness loss in frame corners amounts to as much as 62% (−2.79 EV). What's more, stopping down is not especially satisfactory even if it helps a bit. By f/4.0 vignetting still reaches a very high level of 49% (−1.95 EV), by f/5.6 it decreases to 44% (−1.65 EV), and by f/8.0 it is 36% (−1.28 EV). A slight decrease can be also observed by f/11.0, where we got 32% (−1.11 EV). Further stopping down didn't have any measureable influence on the aberration, described in this chapter.
| Sony A7R II, JPEG, f/2.8 |
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