Carl Zeiss Touit M 50 mm f/2.8
4. Image resolution
Let’s remind here that the best fixed-focus lenses tested in that way have reached results of 70-72 lpmm and the decency level is situated near 40-41 lpmm. How the tested lens compares here? An appropriate resolution graph with values in the frame centre and on its edge is presented below.
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As you can notice the Zeiss company once again forced us to revise the opening paragraph of this chapter. The tested lens is able to get to a sensational value of over 70 lpmm already at the maximum relative aperture and on stopping down to f/4.0 it reaches a record level of 74.4 ±0.9 lpmm. A round of applause!
The performance on the edge is not as impressive. Even though there are no problems there and the image is useful even with the lens wide open, compared to the achievements in the frame centre a result of over 54 lpmm doesn’t bowl us over. The chromatic aberration is responsible; it will be described in more detail in the next chapter.
To sum up it would be difficult not to assess the performance of this lens in a positive way as it is able to provide a truly sensational image quality already at the maximum relative aperture and on stopping down it breaks resolution records. Even lacklustre results on the edge of the frame couldn’t change our very good impression of the Touit 2.8/50M.
At the end of this chapter we present crops taken from photos of our testing chart saved as JPEG files (with the lowest sharpening level) along with RAW files, used for the analysis presented above.
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