Lens review

Viltrox AF 75 mm f/1.2

12 December 2023
Maciej Lata³³o

4. Image resolution

The resolution test of the Viltrox AF 75 mm f/1.2 was based on RAW files from the Fujifilm X-T2 camera. These files were developed with dcraw program (with the 3-pass X-trans filter algorithm) and analyzed by the Imatest software package.

Let’s remind here that the best fixed focal length Fujifilm X lenses, tested that way, can reach as high as about 80 lpmm and the decency level is situated near 44-45 lpmm. Record results on this sensor are near 85 lpmm and higher; so far the best resolution we measured while testing the Fujinon XF 56 mm f/1.2 R WR (92.8 ±1.1 lpmm) and the Fujinon XF 18 mm f/1.4 R WR (93.5 ±0.9 lpmm).

Let's check how the Viltrox AF 75 mm f/1.2 compares here – its results in the frame centre and on the edge of the frame presents a figure below.

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Viltrox AF 75 mm f/1.2 - Image resolution

Before we start the description of the graph you might wonder what lenses are able to break resolution records. It seems models with focal lengths from 35 to 135 mm are the best candidates and for two major reasons. Firstly, they don't have to correct huge fields of view. Secondly, in their case you still can reach f/1.0-1.4 aperture all the time preserving limited physical dimensions and moderate weight. Such an aperture fastness allows you, in turn, to produce images practically devoid of optical aberrations by f/2.8 so at a point where resolution records are broken most often.

As you see the Viltrox AF 75 mm f/1.2, being an equivalnet of a full frame 112.5 mm, fits that description to a dot. If you still remember its complex optical design you won't be surprised by the situation presented by the graph above.

The Viltrox 1.2/75 gets to 85 lpmm already at the maximum relative aperture, something out of reach for many system primes even on stopping down. By f/1.4 you see a result of over 89 lpmm which, even several years ago, would be a new resolution record. By f/2.0 we do get a new record, because the Viltrox is able to exceed an outstanding value of 98 lpmm. Is it all? No. By f/2.8 this new record is broken with a value of 99.8 ± 1.2 lpmm. Really, it's very hard not to be impressed by such a performance.

The resolution on the edge of the frame is noticeably weaker – by some apertures the difference, when compared to the frame centre, reaches even 30 lpmm. Still, the reference level being so high, it would be difficult to complain, objectively speaking. Even at the maximum relative aperture you get a result exceeding 61 lpmm and on stopping down you are able to reach very high values of over 70 lpmm.

The tested Viltrox offers you not only an excellent aperture fastness but also breaks resolution records in the frame centre and provides high image quality on the edge of the frame up from the maximum relative aperture. 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/1.2
Viltrox AF 75 mm f/1.2 - Image resolution
Fujifilm X-T2, JPEG, f/2.8
Viltrox AF 75 mm f/1.2 - Image resolution