Adapting a lens that has no focus?

Discussion in 'Beyond the Basics' started by Yan Lauzon, Oct 27, 2018.

  1. Yan Lauzon

    Yan Lauzon TPF Noob!

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    I acquired an "unknown" soviet lens off ebay, as a way to try new things. All I knew about it was its m42 mount. I didn't quite know what to expect until it recently got here. It has no markings.

    The lens has a working iris and nothing to focus. Come to think of it, either it is incomplete or that's some sort of projection lens.

    The barrel protrude beyond the lens and has threading on the outside, as to attach something else.

    If I hold the lens a few cm away from the camera I can achieve focus. I ordered a focusing bellows as a quick way to use the lens (still waiting on it) but would like to know of other options to adapt this into a useable lens.

    Any ideas greatly welcomed.


    [​IMG][​IMG][​IMG][​IMG][​IMG]


     
  2. dxqcanada

    dxqcanada Been spending a lot of time on here!

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    I've never had a Russian lens ... nor an M42 ... but I will guess ...
    Yes, looks incomplete ... I would guess the front focus cell is missing.
    Possibly an outer barrel of some sort (that would turn to adjust focus) ?
    With an M42 mount there should also be a pin sticking out the back to actuate the aperture ... yours has a slot, hmm.
     
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  3. Yan Lauzon

    Yan Lauzon TPF Noob!

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    Thanks for the inputs.
    I wonder if I can manage to find a replacement front focusing element.


    The aperture is free, I can dial it and it remains open/closed. I wonder if that's by design or if it has been tempered with.

    Regardless, it's an interesting project, for which I am digging to find more information.
     
  4. dxqcanada

    dxqcanada Been spending a lot of time on here!

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    You are quite adventurous.
     
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  5. john.margetts

    john.margetts No longer a newbie, moving up!

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    Russian M42 lenses were often not automatic - ie did not have that pin to close the aperture - my 1972 Helios 44 that came with my Zenit E did not have that pin.

    I agree that the lens is incomplete and should have a further element (or two) that provide the focus.
     
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  6. Yan Lauzon

    Yan Lauzon TPF Noob!

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    Thanks for confirming my impressions.

    Do you think I could scavenge elements from other broken lens? There are numerous lens on ebay sold as-is, I may be looking for cheap donner lenses if the idea makes sense.
     
  7. Yan Lauzon

    Yan Lauzon TPF Noob!

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    I am looking at m42 focusing helicoid, thinking that may very well do the trick. Anyone ever tried that?
     
  8. SquarePeg

    SquarePeg hear me roar Staff Member Supporting Member

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    I have a projector lens adapted for my Fuji mount. I bought it already adapted but I can tell you that the person who made it used some gears and a cylinder that expand and contract which is sort of a focusing mechanism. I do a lof of focusing by my feet. It has awesome bokeh though so I like using it.

    I think I posted a photo of it on here. I’ll see if I can find it. Here’s a photo taken with the lens which is a Pentacon 80mm AV 2.8

    [​IMG]
     
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  9. Derrel

    Derrel Mr. Rain Cloud

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    Camera Adjustable Focusing Helicoid Ring Adapter Macro Extension Tube M65 36-90 | eBay

    I would do some searching on this search string.
    Adjustable Focusing Helicoid Ring Adapter
    Still, if the front cell is missing, this lens might still be a dud. try "free-lensing it, or "reverse-direction free-lensing", and see if you can get it to form an image on a d-slr or mirrorless camera. If not...I would write this lens off, and buy a lens with known functionality and a full component of lens parts/elements.
     
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  10. Yan Lauzon

    Yan Lauzon TPF Noob!

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    Thanks @Derrel.
    I already tried free-lensing it.

    It seems I can manage to focus far away around 1.5-2cm from the camera, and focus rather close at 4-5 cm

    Ideally I'd like something that can vary between 12mm and 60mm, but I don't think that's possible. Maybe stacking two up.


    I didn't think about reverse-lensing it... Thanks for the idea. I just tried. I can focus at about 2 feet, or closer if I free-lens it.
     
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  11. Derrel

    Derrel Mr. Rain Cloud

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    You might be able to rig something up with a body cap, and then a drill and small bit, and a file, some epoxy, and some PVC pipe pieces, etc..
     
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  12. Yan Lauzon

    Yan Lauzon TPF Noob!

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    Some rack-and-pinion style focuser a la telescope would be nice too, but simple tight fitting may be interesting, thanks for the idea.
     
    Last edited: Oct 28, 2018
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