Viltrox AF 27 mm f/1.2 review

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Viltrox AF 27 mm f/1.2

11 April 2025

Maciej Latałło

4. Image resolution

The resolution test of the Viltrox AF 27 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 90 lpmm and the decency level is situated near 44-45 lpmm. 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 27 mm f/1.2 compares here – its results in the frame centre and on the edge of the frame presents a graph below.

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Viltrox AF 27 mm f/1.2 - Image resolution

Image resolution in the frame centre is simply sensational. Already at the maximum relative aperture you deal with a very good level of almost 75 lpmm. On stopping down the aperture you deal with outstanding values of about 100 lpmm. The final effect is such that the Viltrox AF 27 mm f/1.2 with the result of 97.5 +/- 1.5 lpmm, reached by f/2.8, manages to reach the podium of our record-breakers. Viltrox optics specialists can be proud of themselves because now two of their lenses occupy two first places of our ranking – a round of applause!

The results on the edge of the frame are weaker and a noticeably slower reaction of MTFs on stopping down of the aperture is to blame. Still, such results you can call moderate only if you compare them to outstanding results in the frame centre; in general they remain good. Even at the maximum relative aperture the tested Viltrox gets to almost 63 lpmm so almost 20 lpmm above the decency level. In this case, even by f/1.2 we are able to reach a very good image quality across the frame. On stopping down the aperture the maximum results reach a very high level of almost 73 lpmm.

We have no doubts that the resolution performance of the Viltrox 1.2/27 is outstanding, exactly like in case of the 1.2/75 model we tested earlier.

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