Can a Jupiter-12 35mm f/2.8 be used on a Fujifilm X-Pro1 with an adapter?
Asked 6/9/2016
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I use a Fujifilm X-Pro1 with a Jupiter-8 and a Tarion adapter, and that setup works fine. I’m considering a Jupiter-12 35mm f/2.8 for a wider view, but I’ve read that the rear element on the Jupiter-12 may protrude too far and interfere with the recessed sensor area on some mirrorless cameras. Will a Jupiter-12 physically fit and work on the X-Pro1 with this type of adapter, or is there a clearance problem?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
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The problem with using the Jupiter 8 on a camera with a cropped sensor isn't that the back of the lens will touch the sensor. The adapter ring, such as your "Tarion", insures that the rear of the lens will remain in front of the sensor since it establishes a registration distance for which the lens was designed. The problem is that the rear of the lens is too large to fit into the recessed alcove that surrounds most cropped sensors, including the sensor for your X-Pro1. Notice in the photo below that the rectangular cutout the same size as the recessed sensor is very close to the lens mounting flange. If the Jupiter 12 extends that deeply past the rear of the camera-side flange of the Tarion adapter (and it does when focused at certain distances) then it won't fit into the light box of the camera.
Post #3 at this thread on the Fuji X forum bears this out.
Originally by user15871. Source · Licensed CC BY-SA 4.0
user15871
10y ago
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Probably not. The main issue is not that the lens would touch the sensor directly. A proper adapter maintains the correct registration distance, so the sensor itself is protected. The problem is physical clearance inside the camera mount area: the Jupiter-12’s rear section protrudes deeply behind the adapter flange, especially at some focus distances, and the X-Pro1 has a recessed sensor/light-box area around the sensor. According to the community answer, the Jupiter-12 is too large/extends too far to fit into that recessed area on the X-Pro1. So even with your Tarion adapter, this lens is not a safe or reliable match for that camera body.
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