24 Feb 35mm Lenses on the Fujifilm GFX 50S

Source: Fujifilm Insider

At Photokina 2016, Fujifilm shocked the photographic industry by announcing the production of the GFX 50S, a mirrorless medium format digital camera with a redesigned 44x33mm CMOS sensor. Unlike the Hasselblad X1D that was announced months prior, the GFX 50S sported both a focal-plane shutter and full electronic shutter. This game-changing feature meant that users could use any of their vintage medium format lenses onto the GFX 50S; the G mount system was now open to the vast ocean of lenses from the 19th century and onwards.

The design of a lens, focal length of a lens, aperture, number of elements, focus distance, default flange distance, size of the front and rear elements all contribute to the size of the image circle projected by the lens. A telephoto portrait lens with a large aperture would have relatively wide front and rear elements; resulting in a bigger image circle than the image format it was designed for. We can apply this knowledge to say that many 35mm lenses will cover the 44x33mm format of the GFX 50S.

In order to test out this theory, I had to first find a way to adapt 35mm lenses onto the GFX 50S. Being a mirrorless camera, the flange distance of the GFX 50S is a short 26.7mm. Canon EF lenses have a much longer flange distance of 44.0mm, meaning that if one creates an adapter wih a length of 17.3mm (the difference in flange), the adapted Canon EF lenses would retain the same focusing range on the GFX 50S as it would on any Canon EOS body (including the ability for infinity focus). Using the mount specifications of a GFX 50S brochure, I was able to 3D-print a prototype EF to G-mount adapter at the local library….

35mm Lenses on the Fujifilm GFX 50S posted on Fujifilm Insider on .

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