Repair – aperture ring – Fujinon XF 14mm F2.8 lens

Fujinon XF 14mm F2.8 is an ounstanding lens in Fuji line. It has exceptional optical quality and very fast autofocus. There is only 1 flaw that was bothering me – the aperture ring is very loose and often changes position without letting me notice that.

I’ve disassembled the rear area to see what can be done.

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Disassembly steps here are quite simple. Unscrew mount ring bolts, and bolts on inner black plastic ring. Pull out the plastic ring and mount ring. Remove large flat metal shims. Unscrew bolts holding the ring with “14” letters on it, pull out that ring.

Now you can make and insert thin strip of rubber on top of aperture ring side like here:

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It should sit firm there, so when you mount “14” labeled ring back and secure all 3 bolts the aperture ring should rotate more tight.

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You may be also interested in securing aperture mod for Fujinon XF 35mm F1.4 R lens

5 comments

  1. Hi,

    Thanks for your pictures. I’d like to tighten up my 14 mm aperture ring as well. I’ve dissasembled my lens a few times and am confident of being able to do this.

    I have attempted something similar in the past and but I eventually removed my mod – the way I had tried it was to remove the aperture ring entirely, then add thin tape to the lens barrel and re-install the aperture ring, having effectively made the barrel diamter slightly greater. However, I found that this gave an unpleaseant handling characteristic to the aperture ring as the torque required to rotate it was variable over the aperture range, and the ring felt more “stiff” than “damped” whcih I did not like.

    So my question is as to the exact placement and physical size of the rubber insert you used: is it sitting betweent the fixed “14 ring” and the moving surface of the aperture ring or did you slip it betwen the aperture ring and the lens barrel? if you did the former, is there any chance of lens misalignment as the mount is attached directly to the “14 ring” which now has pressure from the rubber insert trying to push the lens barrel and elements off-axis?

    Thank you,

    FnF

    Liked by 1 person

    • I owned Fuji XF 14mm F2.8 from initial production line, and my sample had obvious longitudinal play of aperture ring. Unlike in XF 35mm F1.4 it was easy to move XF 14mm aperture ring up and down to about 2mm. It was really looking like Fuji factory just forgot to insert some king of thin plastic or rubber ring to keep aperture ring on place. Like you I also disassembled the aperture ring area completely and considered adding tape to increase inner diameter, but it would not solve longitudinal play of the ring. So I skipped “tape mod” and just experimented with adding different materials between the aperture ring and “14 ring”. Fortunately aperture ring side have some kind of slots on the side, so I shaped thin piece of rubber to fit that slot. Piece should be perfectly shaped and sit inside one of the slot to prevent it from escaping during ring rotation. This solution solves my both concerns – too easy radial rotation, and longitudinal play of aperture ring. I can’t say exact thickness of the rubber, and you may have different rubber dencity. I think I used piece from bicycle tire inner tube.
      It’s important point about lens barrel. If you select too thick rubber piece that prevents “14 ring” to sit properly – aperture ring will simply stuck. Any rubber piece inserted there and still allowing aperture ring to keep rotating will also allow the “14 ring” to sit firm at it’s place. Mount ring lays slightly on top of “14 ring” – metal shims go on top of inner lens frame, so there should be no off-centering of the mount.

      Like

      • Many thanks for the prompt reply. What you say makes a lot of sense and it is what I assumed from your post, but I wanted to check! I will experiment with various thicknesses of rubber and see where I get to – I don’t have the longditudional play that you describe so I think I will need quite a thin “shim” to avoid putting unde load on teh aperture ring or mount base.

        I’ll let you know how I get on!

        Like

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