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Thread: ? use of Oscilloscope lenses in LF?

  1. #11

    Join Date
    May 2015
    SooooCal/LA USA

    Re: ? use of Oscilloscope lenses in LF?

    What I have done when needing a focusing mount is to find junk metal 35mm faster normal lenses (with your camera mount) and strip them down... Harvest the optics for experimental lenses or loupes, remove iris assy and anything else in the way...

    Front group usually has a front shroud with a set screw or 3, and will unscrew... Group has a set screw, then it will unscrew... Rear group will unscrew, but maybe some thread lok acetone will loosen... F ring might have a set screw on bottom, then all iris stuff out... Might have light baffle stuff, so remove...

    But first see how high the (lens) mount is and if the new lens might slide into it (hope you can focus to infinity)... Many o-scope lenses are 75mm (3"), so that should be around the extension lens to "film" plane...

    But if there's a big fat rear element on your new lens/shutter, it won't fit into the mount... And you will have to jury rig a way to hold lens to mount, but rubber or plumbing stuff might do the trick...

    Try not to damage any of the mount ' s threads, as you might later like the lens enough to have a machinist make permanent metal parts for long term use...

    Have fun!!!

    Steve K

  2. #12

    Join Date
    Jan 2019

    Re: ? use of Oscilloscope lenses in LF?

    You can buy focusing mounts now for relatively little money. Look on ebay for "focusing helicoid." They come with a variety of threads like M42 or M58 - probably easy to find adapters for a micro 4/3 camera to M42, use step rings to get to M58? Some of the market for these appears to be people adapting M42 lenses to small format digital, and I'm not sure what the application is for the M58 mount (maybe some Russian or Pentacon thing uses M58?) Anyway, these seem to be much easier to get than previously. I haven't bought one yet, but became aware of them from Dirk Fletcher's panoramic rollfilm camera build at

    IMO the application for these oscilloscope lenses might be to get an oscilloscope. Make oscilloscope art, and document it.

  3. #13
    Jan Becket's Avatar
    Join Date
    Mar 2009
    Honolulu, Hawai'i

    Re: ? use of Oscilloscope lenses in LF?

    Dan was more correct than he realized in commenting that these lenses are "poisoned." I was given one and happened to measure it with a Berkeley Nucleonics rad meter, a fairly good one. The background radiation where I lived at that time (Hawaiʻi) was 40 CPM, more or less. Thatʻs normal. Within 12 inches, the lens measured 1300 CPM (counts per minute). Thatʻs definitely not normal. You would not want to sleep with one of these under your pilow. I ended up giving mine to the Hawaiʻi State Dept. of Health office that deals with radiation issues - they wanted it for demonstrations. Not sure, but that level of radiation might technically kick the lens into the hazardous waste zone.

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