What mount is the Fujinon 135mm f/3.5 'X-Fujinon-T' lens, and can it be adapted to Canon EF?
Asked 5/1/2018
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I have a Fujinon lens marked “EBC X-FUJINON-T” and “1:3.5 f=135mm DM” on the front ring. What mount is it? Can this lens be adapted to a Canon EF DSLR, and if so, how practical is it?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
8y ago
2 Answers
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X-Fujinon says it all - that's Fujica X-mount, the one Fuji used on their SLR cameras from the early 1980s, before current mirrorless X-mount.
Fujica X-mount has focal flange depth of 43.5mm, so there is no way to effectively use this lens on Canon EF-mount body since EF-mount had bigger focal flange depth of 44mm - there is no way to achieve focus to infinity. On the other hand, you could remove the current mount, grind down a lens for 0.5mm, add an EF-mount onto it, possibly removing the aperture lever in the process, those levers are known for getting stuck on a mirror on Canon full-frame DSLRs. If you have an access to machinery needed for that, I'd say go for it, document the process and put it on the internet for future generations.
Also, you can use that lens on any mirrorless camera with just a simple, cheap adapter available almost everywhere.
Originally by user7212. Source · Licensed CC BY-SA 4.0
user7212
8y ago
0
Generated from our catalog & community — verify before relying on it.
The “X-Fujinon” marking identifies it as a Fujica X-mount lens, used on Fuji SLRs in the early 1980s. It is not related to Fuji’s modern mirrorless X mount.
Adapting it to Canon EF is generally not practical if you want infinity focus. Fujica X has a flange distance of about 43.5mm, while Canon EF is 44mm. Because the EF mount sits slightly farther from the sensor, a simple mechanical adapter would place the lens too far away, preventing infinity focus.
In theory, a permanent mechanical conversion could be done by modifying the lens mount and shaving material to compensate, but that’s a custom machining job, not a cheap or easy adapter solution. It may also interfere with aperture linkage parts.
This lens is much better suited to mirrorless cameras, where the shorter mount distance makes adaptation straightforward with the proper adapter.
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