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Thread: Can't focus with Opton Oberkochen f/4.5 150 mm lens (due to missing rear element?)

  1. #1

    Join Date
    May 2019
    Posts
    12

    Can't focus with Opton Oberkochen f/4.5 150 mm lens (due to missing rear element?)

    I am unable to focus on anything with a Opton Oberkochen f/4.5 150 mm lens whereas I have no problems with another 150 mm lens. I noticed the Opton has no elements behind the shutter (see the picture). Is that the reason?

    Click image for larger version. 

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ID:	192378 Click image for larger version. 

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    Assuming that is the explanation, is there a fix? I guess such rear elements are not simply laying around (except the ones that fell of this lens, ha ha). Will the lens be of use to anyone else? (The Copal shutter isn't working properly either; the lens was used with a Sinar shutter).

  2. #2

    Join Date
    Dec 2001
    Location
    NJ
    Posts
    7,299

    Re: Can't focus with Opton Oberkochen f/4.5 150 mm lens (due to missing rear element?

    No fix. The lens is a Tessar. Tessar front cells can't form images. If the seller can't supply the lens' rear cell, send it back. If you misplaced the rear cell, look for it.

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