Cosigna Voigtlander 40 mm f/1.4 Multi Coat on Fuji X Pro1

Cosigna Voigtlander 40 mm f/1.4 Multi Coat on Fuji X Pro1

How does this classy range finder lens compare to the new Fuji 35 mm f/1.4?

This is a quick update from my review of the Single Coat version on the NEX 3.

Optical Performance

Please click on the tab you want to view. Only 1 tab may be active at a time. MTF, Distortion, and Lat CA data acquired using Imatest

Comments on the Results

This lens has good center sharpness at f/1.4, but corners are weak wide open. Sharpness improves steadily when stopping down. Center reaches excellent levels by f/2 and corners are barely decent by f/2.8 and excellent by f/5.6.

Distortion is showing 0.38% pincushion, but on my NEX 3 I didn’t have any, so I might have introduced this using the Fuji M adapter and having it correct for light barrel distortion that I figured this lens would have, and it seems it might have corrected the RAW too? I will experiment more. Either way this will have negligible impact on performance numbers.

Lateral CA is also well controlled and improves on stopping down. Longitudinal CA is very visible at f/1.4, and probably worse than average for this class of lens. It mostly disappears on stopping down.

Purple fringing is visible mostly at f/1.4, and improves on stopping down.

Coma and astigmatism are pretty negligible, but there is some deformation of the bokeh circles in the corner wide open that disappear once stopped down.

Spherical aberration is severe wide open. There is a focus shift with the lens. Focus at aperture you shoot at, don’t focus at f/1.4 and shoot at f/5.6, focusing at f/4 and shooting at f/11 or something would be fine as the focus shift is mostly at large apertures.

Flare resistance is much better than the single coat version. Get this version to shoot in contra light.

I measured the focal length to be 43mm based on 1:53 magnification.

Pros and Cons

Bottom Line

This lens is a beautifully constructed and compact 40 mm f/1.4 lens. It has character. That is to say it produces a lot of aberrations, but thankfully it is a good lens in that the aberrations go away when you step down and are nearly gone by f/5.6. This means that in the center it is fine for some available light portrait shots, etc. Bokeh can be interesting if the background gets complex. If you want to shoot a landscape or sharp across the frame shot, you have to step down substantially.

Overall, the lens is good, is a bit longer than the Fuji 35mm f/1.4, but the fuji is much sharper, but by f/5.6 it should be hard to tell them apart. The fuji is about the same at f/2.8 as this lens is at f/5.6. I still recommend this lens, but it isn’t for everyone. It is for those looking for a classic large aperture prime for manual focus and to emphasize images with its special character.

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