Venus Optics LAOWA 9 mm f/2.8 ZERO-D
8. Vignetting
| Fujifilm X-T2, f/2.8 | Fujifilm X-T2, f/4.0 |
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| Fujifilm X-T2, f/5.6 | Fujifilm X-T2, f/8.0 |
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You can say the results are in accordance both with our expectations and with performance of other small instruments like, for example, the Laowa 2/7.5, tested by us not so long ago. At the maximum relative aperture vignetting reaches as high as 66% (−3.12 EV), a truly huge value. Unfortunately stopping down doesn’t help in a satisfying manner. By f/4.0 the brightness loss in the frame corners reaches still 56% (−2.38 EV) which is a lot, and by f/5.6 the vignetting level remains still high as it amounts to 51% (−2.08 EV). Then the situation doesn’t become noticeably better. By f/8.0 the light fall-off gets to 49% (−1.95 EV), by f/11 it is 47% (−1.85 EV), and by f/16 it decreases slightly to 46% (−1.80 EV).
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It is clear that, even after a significant stopping down of the aperture, you cannot limit the vignetting in a distinct way. It is a very bad piece of news. Still such is the price you have to pay for small physical dimensions of the tested lens. You have to be aware of it before you decide to purchase the Laowa.
| Fujifilm X-T2, JPEG, f/2.8 |
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Below we present averaged out values of brightness loss shown in concentric circles as you move further away from the frame centre. The numerical value for every image, expressed in percents, shows the area limited from the top and right by 100% and from the bottom by the presented curve. The area indicates how much light overall is lost due to the vignetting effect. Please don’t mix these percentages with the values given at the beginning of the chapter because they aren’t directly connected.
