Disassembly – 7artisans 35mm F1.2 lens [part 1]

Today my goal was to fix small problem with unmounting 7artisans 35mm F1.2 lens from the Fujifilm camera. During recent 7artisans 35mm F1.2 lens review I’ve realized that this lens can stuck when the lens lock pin of the camera catches one of lens mount bolt location. So I’ve disassembled the rear area to see what can be done.

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You will need T6 Torx screwdriver to start the disassembly.

First, gently unscrew all three T6 bolts, they are nicely secured with blue adhesive so little effort is required. After that you can take off the mount ring, aperture ring, and may optionally unscrew one of the inner ring (better skip that for now).

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Important NOTE: my sample has three tiny shims on one bolt located near the lens lock socket. I think that 7artisans factory are familiar with “unmounting lens” problem, and it looks like one of possible easy solution. They just added 3 shims to lift up the T6 bolt head. Probably my sample has this bolt a bit overtightened, so it’s not lifted up enough. I’ll check it whan assembling the lens back, and tightening it properly (or adding extra 1 shim) should solve the problem.

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Why to stop now, I’d like to go forward a bit. 7artisans lens has click-less aperture ring. I want to discover how it is implemented to see if I can modify it later to click-stop version.

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Gently unscrew the First aperture bolt shown above. Why first? This bolt is just a part of more complex system. After unscrewing it you can pull out inner aperture “transmission” ring that transfers rotation to the Second aperture controlling bolt.

I like that solution, it definitely gives few options to add click-stop mechanism at the place where this “transmission” ring is located. Hmm, I’ll probably do that in the nearest future : )

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I’ve marked the rear lens group frame position and tried to pull it out, but it didn’t go. Well, not required now so I’ll stop disassembly at this point, as there are no dust inside to clean. What I like to see here are another Torx bolts are used to secure helicoid guiders – 7artisans engineers really like Torx bolts : )

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One more view from the side. The long silver scratch was there initially, looks like factory scratch. The helicoid has plenty of grease everywhere which is great to see. You can easily lubricate it in the future with simple access to many areas at this point.

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Few more observations. The silver mount rings is very light – 1/2 Oz (16g), which means that more light alloy is used ant probably it’s not solid brass (it also has yellowish color). I’ve made mount bolts frame edges smooth and then assembled the lens back.

During tightening T6 bolts I’ve tightened the one with three shims to a bit higher position, so its cap is on the same level as mount surface. After that it’s super easy to unmount the lens from camera.

You may also want to check 7artisans 35mm F1.2 diasassembly – Part II

11 comments

    • No, it is not possible to adapt 7Artisans 35mm F1.2 lens to Leica M mount.

      Even if you replace Fuji/Sony mount ring with Leica M ring – lens core will be too far from Leica sensor (about 10mm more far) so you will not be able to focus to infinity.

      Technically, 7Artisans 35mm F1.2 has some range of infinity focus adjustment that may add few mm, but it will not be enough.
      Also, this lens is only covering APS-C image circle size, and will not cover FF completely.

      Like

  1. Hello,
    the lens core of my 1,2/35 for EOS M has a lot of play on axis and rotation and little play radial (sorry for my ,,long time ago german school english‘‘).
    How can I fix it?
    Thanks

    Like

    • Great! Glad you found solution. I was out of town and just read your messages. Yes it happens with new lens that something is not completely tightened. I think they have to keep the price low and not every produced lens is fully tested.

      Like

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