Fujifilm Fujinon XC 35 mm f/2
8. Vignetting
| X-T2, JPEG, f/2.0 | X-T2, RAW, f/2.0 |
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| X-T2, JPEG, f/2.8 | X-T2, RAW, f/2.8 |
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| X-T2, JPEG, f/4.0 | X-T2, RAW, f/4.0 |
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When you work with JPEG files you don't have to worry almost at all. Already at the maximum relative aperture vignetting amounts to just 19% (−0.61 EV), and on stopping down to f/2.8 it decreases to a level of 11% (−0.35 EV). What's interesting, changing the aperture to f/4.0 doesn't make any big difference and only after employing f/5.6 the problem disappears completely (7%).
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Still, only analysis of RAW files developped by independent software is able to reveal the truth about how optics deals with vignetting. There are far more problems, especially at the maximum relative aperture, where this aberration reaches 45% (−1.75 EV). On the one hand it's a lot, on the other hand the result is hardly a surprise – when you try to combine small physical dimensions and a good f/2.0 aperture fastness it cannot end well. Quid pro quo...
When you stop down the aperture to f/2.8 vignetting decreases to 25% (−0.85 EV), and by f/4.0 it drops to a level of 20% (−0.64 EV). On further stopping down the decrease of vignetting is slight. By f/5.6 the aberration reaches 18% (−056 EV), and by f/8.0 it amounts to 14% (−0.46 EV). You get some, but fortunately small chances, to notice light fall-off even by f/11 where that aberration's level approaches 11% (−0.33 EV).
| Fujifilm X-T2, RAW, f/2.0 |
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