Fujifilm Fujinon XC 15-45 mm f/3.5-5.6 OIS PZ
8. Vignetting
Let’s glance at thumbnails below in order to assess the JPEG files vignetting level of the tested lens while attached to the Fujifilm X-T2 camera
Fujifilm X-T2, JPEG, 15 mm, f/3.5 | Fujifilm X-T2, JPEG, 15 mm, f/5.6 |
Fujifilm X-T2, JPEG, 28 mm, f/4.5 | Fujifilm X-T2, JPEG, 28 mm, f/5.6 |
Fujifilm X-T2, JPEG, 45 mm, f/5.6 | Fujifilm X-T2, JPEG, 45 mm, f/8.0 |
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At the 15 mm focal length and by f/3.5 aperture the brightness loss in frame corners amounts to 22% (−0.71 EV). If you stop down the lens slightly to f/4.0, the aberration decreases to 20% (−0.66 EV). What’s interesting, by f/5.6 you return to the level of 22% (−0.70 EV) and by f/8.0 the vignetting decreases to 17% (−0.56 EV). It seems these ups and downs are an effect of cropping and selective correction of vignetting at different apertures.
In the middle of the focal length range the light fall-off would be difficult to notice even at the maximum relative aperture as its level is just 8% (−0.24 EV). A very similar situation can be observed at the maximum focal length because the aberration level reaches only 9% (−0.28 EV).
Now let’s check the real performance of the lens by analyzing RAW files.
Fujifilm X-T2, RAW, 15 mm, f/3.5 | Fujifilm X-T2, RAW, 15 mm, f/5.6 |
Fujifilm X-T2, RAW, 28 mm, f/4.5 | Fujifilm X-T2, RAW, 28 mm, f/5.6 |
Fujifilm X-T2, RAW, 45 mm, f/5.6 | Fujifilm X-T2, RAW, 45 mm, f/8.0 |
At a combination of wide angle and f/3.5 aperture, very difficult to correct, the vignetting amounts to as much as 56% (−2.37 EV) and then drops to 51% (−2.06 EV) by f/4.0. By f/5.6 the vignetting decreases further to 40% (−1.46 EV), by f/8.0 it is 36% (−1.27 EV), and by f/11 it decreases to 31% (−1.09 EV).
In the middle of the focal length range there are far less problems. By f/4.5 brightness loss in frame corners is 26% (−0.87 EV) and then it decreases to 20% (−0.64 EV) after applying f/5.6. By f/8.0 you can observe further decrease, this time to a value of 17% (−0.54 EV).
Similar situation can be witnessed at 45 mm where, at the maximum relative aperture, the vignetting gets to 24% (−0.80 EV) and decreases to 18% (−0.57 EV) on stopping down the aperture to f/8.0. By f/11.0 that aberration reaches 16% (−0.50 EV).
Fujifilm X-T2, 15 mm, RAW, f/3.5 |
Fujifilm X-T2, 28 mm, RAW, f/4.5 |
Fujifilm X-T2, 45 mm, RAW, f/5.6 |