Viltrox AF 56 mm f/1.7 Air
4. Image resolution
Let’s remind here that the best fixed focal length Fujifilm X lenses, tested that way, can reach as high as about 90 lpmm and the decency level is situated near 44-45 lpmm. So far the best resolution we measured while testing the Fujinon XF 18 mm f/1.4 R WR (93.5 ±0.9 lpmm), the Viltrox AF 27 mm f/1.2 (97.5 ±1.5 lpmm) and the Viltrox 75 mm f/1.2 (99.8 ±1.2 lpmm).
Let's check how the Viltrox AF 56 mm f/1.7 Air compares – its results in the frame centre and on the edge of the frame presents a graph below.
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Like its brothers with shorter focal lengths, the tested lens impresses us. Already at the maximum relative aperture you see a very high resolution, reaching almost 73 lpmm. By f/2.8 and f/4.0 we got, respectively: 92.1 and 92.0 lpmm (with measuring error on a level of 1-1.5 lpmm). Taking into account measuring errors it's clear the small, cheap Viltrox manages to brush against the record-breaking values.
In order to assess these results properly let's compare the performance of the Viltrox to results of the Fujinon XF 50 mm f/2 R WR, so praised by us.
The advantage of the Viltrox is very clear; of course you should mention the fact that this lens had it a bit easier when it comes to reaching high MTFs because it is faster. On the other hand, it is also over two times cheaper...
The Viltrox 1.7/15 and 1.7/25 models managed to get high results in the frame centre by sacrificing a bit the performance on the edge of the frame. This trend was broken by the 1.7/35 model so we were very curious what path the portrait 1.7/56 device would follow.
The graph above shows clearly that it fares exceedingly well, outpacing noticeably the more expensive Fujinon. It's true that the graph is a bit untypical, with a slight slump by f/2.8, but anyway in the wide aperture range from f/1.7 to f/5.6 you are able to achieve very high results, keeping the area close to 70 lpmm.
To sum up once again the cheap Viltrox deserves to be praised for its sensational performance. A round of applause!
At the end of this chapter, traditionally, we present crops taken from photos of our resolution testing chart, saved as JPEG files along with RAW files we used for our analysis.
| Fujifilm X-T2, JPEG, f/1.7 |
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| Fujifilm X-T2, JPEG, f/2.8 |
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