Voigtlander Ultron 27 mm f/2
4. Image resolution
Let's remind here that the best fixed focal length Fujifilm X lenses, tested that way, are able to reach as high as 80 lpmm and the decency level is set near 44-45 lpmm. The resolution record for this sensor amounts to about 85 lpmm and higher, with the best result belonging to the Fujinon XF 56 mm f/1.2 R WR (92.8 ±1.1 lpmm), the Fujinon XF 18 mm f/1.4 R WR (93.5 ±0.9 lpmm), and the Viltrox 75 mm f/1.2 (99.8 ±1.2 lpmm).
Let's check how the Voigtlander Ultron 27 mm f/2 compares – its results in the centre and on the edge of the frame presents a graph below.
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When it comes to the frame centre we have no reasons to complain, especially keeping in mind the fact that you deal here with a pancake type of lens. Already at the maximum relative aperture you get a result exceeding 64 lpmm so as many as 20 lpmm above the decency level. On stopping down the aperture to f/4.0 the lens is able to exceed 80 lpmm, a very good value indeed.
Of course the edge of the frame will be always the biggest challenge for such small, optically simple constructions and, accordingly, there are some problems in this area. First of all, at the maximum relative aperture, the result we got reaches just 36.6 lpmm so images are simply blurry. The lens approaches the decency level on stopping down the aperture to f/2.8 and in the range from f/40 to f/11 the lens provides medium results, of about 50 lpmm. Let's face it, you won't be able to get anything more from this midget, a fact that is quite understandable up to a point.
The summary of this chapter is rather positive – from such a small instrument you shouldn't expect anything more than sharp images in the frame centre. The Ultron provides that much. Weaker edges of the frame are only to be expected and you have to get over it, as they are part and parcel of all 'pancake' lenses.
At the end of this chapter, traditionally, we present crops taken from photos of our resolution testing chart which were saved in the JPEG format along with RAW files, used for the analysis above
| Fujifilm X-T2, JPEG, f/2.0 |
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| Fujifilm X-T2, JPEG, f/4.0 |
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