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Mission Improbable

Discussion in 'Adapted Lens Forum' started by jamie allan, Aug 5, 2017.

  1. jamie allan

    jamie allan Premium Member

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    I've got more than enough 50mm-ish adapted lenses but have always wanted to get a Konica 50mm f1.7. Since I'm retired now I've time to take on a project and this is it.
    konica hexanon 50 f17.jpg

    It's got a damaged filter ring, missing focus rubber and fungus on the glass but according to the seller the aperture blades are functioning correctly and the focus is smooth. I've dismantled Konica AR lenses before (but never the 50mm) to clean them and convert them to 4/3 mount. I'm looking forward to the challenge of getting this working again as it's reputedly extremely sharp when functioning correctly.
     
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  2. ScottyMac

    ScottyMac Well-Known Member

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    You must have steady hands and good eyes. Moving into retirement myself...but I don't think I possess your skills. Let us know how that goes.
     
  3. Gyles

    Gyles Member

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    Great project. Just this minute posted a picture taken with the Hex 50/1.7. Well worth the effort.

    Please login to view links
     
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  4. leoda1945

    leoda1945 Premium Member

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    If possible ....... document the disassembly, cleaning and reassembly process. Hints (like marking things upon disassembly) are important too.
    I disassemble a Hex 40mm and it's still in pieces !!!
    :eek:

    The world needs good instructions :D
     
  5. jamie allan

    jamie allan Premium Member

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    I've taken apart and re-assembled a Hexanon 28,35 and 40 when I modified them for 4/3s use a number of years ago. That actually entailed the use of a dremmel:eek:.
    There's a few sites I've come across to assist with this particular lens. I've already made a softwood former and hardwood punch and I've plans to use a shoe stretcher if that fails.:eek:

    Please login to view links

    Please login to view links

    I'm stumped at present for a focus ring rubber however.
     
    Last edited: Aug 7, 2017
  6. Greg_E

    Greg_E Premium Member

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    how about here? Please login to view links

    I know the US site has rubber cones that will do what you need, if you can get the ring round enough to work again.
     
  7. jamie allan

    jamie allan Premium Member

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    Thanks Greg but the rubber I'm talking about is the rubber covering the focus ring on the lens.

    I've already got a home made tool to get the front ring off.:)

    Lens tool 1.jpg Lens tool 2.jpg
     
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  8. Gyles

    Gyles Member

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    :)looks like you're building yourself a periscope there
     
  9. Greg_E

    Greg_E Premium Member

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    I usually carefully sneak a small screwdriver under that rubber and roll it all the way around to break the glue. The struggle to slide it off the ring, having the screwdriver in to help it jump the ridge in the ring can help. You can often get a small section displaced, roll the screwdriver and push a new section down, eventually once the entire edge is over the ridge, it should slide off with some force.
     
  10. lifesshort

    lifesshort New Member

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    If nothing else, you could try using a piece of bicycle tire inner tube as the focus ring rubber.
     
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  11. Frankie

    Frankie Premium Member

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    @jamie allan...There is a tool for bending filter mount...see: Please login to view links

    You could file down the convex side of the form to fit the lens.
     
  12. jamie allan

    jamie allan Premium Member

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    Well my 50mm f1.7 arrived this morning. Here's a side view
    konica 50 f17 side before.jpg

    I spent a couple of hours on it - fixing the dent, stripping it down, cleaning and re-assembling it. Unfortunately the only guide I could find is for another version of the lens so wasn't that much use to me. I've a problem in that I cannot separate the 3 front elements as I cannot see how to break down the assembly. There's a small amount of fungus on the rear of the front element. I haven't painted it yet and haven't put the nameplate ring back on but it still functions well.
    50 f17 front.jpg 50 f17 side.jpg

    Here's a couple of example shots with no cropping after cleaning.
    At close focus of 0.45m
    clematis 50 f17 2.jpg

    At infinity - the tower blocks are about 0.75km away
    50 f17 infinity.jpg
     
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  13. jamie allan

    jamie allan Premium Member

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    And a couple in the shade at wider aperture. Again no cropping has been done.
    Geranium.jpg yellow.jpg
     
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  14. Knapdale

    Knapdale Well-Known Member

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    Interesting, Jamie.

    Have you tried unscrewing that ribbed flange around the front element? There's a hint on this discussion that it might be as simple as that:
    Please login to view links

    However, I read in another thread that the Konica parts were screwed together very tightly, possibly with thread-lock, which might need some solvent and elbow grease....

    Good luck with it! I'd be interested to see how you get on with it.

    Stan
    p.s. your photo's look great without any further fiddling - but I'd want to get at that fungus, too!
     
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  15. jamie allan

    jamie allan Premium Member

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    Thanks Stan,
    It's a lovely lens I really like it.
    I've spent some time trying to get the front elements separated but can't see how they do come apart. The front elements are held together with a plastic surround. There appears to be two parts to this surround for the front elements and I've stripped the glue with solvent but cannot get them apart. The only issue with leaving the fungus that I think I can see is a lack of contrast in shots taken in bright sunshine.
     
  16. jamie allan

    jamie allan Premium Member

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    Stan,
    I took your advice and stripped the lens again and soaked the front element assembly in isopropyl alcohol. I could see that on opposite sides of the ribbed flange where it joined the other part there was a strip of glue locking the threads. I softened it and then used a sharp point to clear it. Applying a bit of elbow grease the two sections unscrewed. I was able to remove the front element and clean it in vinegar and then in isopropyl alcohol. It's revealed a couple of scratches on the front of the front element - I'd guess someone thought the fungus was on the outside.
    I put it back together and here's a quick shot on a dull day at closest focus of 0.45m and no cropping.
    Konica 50 f17 test..jpg
     
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  17. Frankie

    Frankie Premium Member

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    For that missing rubber ring, peruse...: Please login to view links

    Cheaper and funkier alternative...see: Please login to view links
     
    Last edited: Aug 13, 2017 at 4:56 PM
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  18. Knapdale

    Knapdale Well-Known Member

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    Jamie - Magic, that looks great. Glad you got it sorted. Just enjoy it now - you've earned it!
     
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  19. jamie allan

    jamie allan Premium Member

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    I really like the look of this lens in low light. It's a dull wet day here.
    Yellow Rose.jpg
     
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  20. jamie allan

    jamie allan Premium Member

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    Here's a couple more from the now fungus free Hexanon 50/1.7. It's close focus ability is quite something.
    By the way this cost the price of a packet of cigarettes in th UK. I then pushed the boat out and added a screw on Hoya collapsible hood for £1.99.:D
    f8 1/250 iso400 - this is about 70% of the original image simply to take out stray branches and flowers.
    Red flower 1.jpg
    f8 1/180 iso800 - this is cropped to approx 10% of the original image just to show the detail you can get with this lens.
    Yellow flower 1.jpg
     
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