Voigtlander Septon 40 mm f/2 Aspherical
11. Summary
Pros:
- very solid, metal construction that is also compact and elegant,
- good image quality in the centre of the frame
- negligible longitudinal chromatic aberration,
- no significant problems with spherical aberration,
- low distortion,
- moderate vignetting on an APS-C/DX sensor.
Cons:
- poor image quality at the edge of the frame on both sensor formats,
- slightly too much lateral chromatic aberration,
- severe coma,
- enormous vignetting,
- very pronounced focus breathing,
- poor performance and specifications relative to the price.
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For me, the launch of the Voigtlander Septon 40 mm f/2 Aspherical is a complete misfire. At a price of $700, which is already quite steep for a standard f/2.0 lens, we get a compact and solid metal construction, good image quality in the centre of the frame and low distortion. However, this is simply not enough, because the resolution at the edge of the frame is poor on both sensor formats, while vignetting, coma and focus breathing are enormous, and lateral chromatic aberration is slightly too pronounced. On top of that, we have mediocre performance in terms of astigmatism and work under harsh light. We therefore have very few arguments in favor of recommending this lens.
