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Showcase "Frakenlens" Sony Precision Projection 50-60mm zoom

Discussion in 'Adapted Lens Sample Image Showcase' started by gnarlydog australia, Jul 1, 2016.

  1. gnarlydog australia

    gnarlydog australia Mu-43 Top Veteran

    967
    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    My colleague at work knows that I like to adapt unusual lenses so when he was at the dump getting rid of some trash he spotted a projector getting thrown out. He "dumpster-dived" and saved it. It was in good condition (optically) and I challenged myself to refit that lens.
    Removing the rather hefty lens was easy: a couple of screws and I had a cradle as well.
    On the scale it tipped 53oz. and 7" (1500gr. 180mm long).
    The rear glass element a whopping 65mm, I was not sure if the back-focus will register longer than 19.25mm needed for Micro four thirds cameras. A quick freelens test said YES :dance4:
    The hard bit was trying to "find" and adapter for it: nothing on eBay :whistling:

    27873797222_a778f9d0e6_c. Will it fit?_c by gnarlydog, on Flickr

    But I like ghetto adaptations and with the hardware store just down the road, I found some PVC plumbing pipes and fittings that cutting and Dremel-ing brought together into a nice adapter.
    The lens is not small (that's typical Australian negation-style description) and using it freehand is kind of like at the gym doing free weights :frown:

    27924555202_8ac10bf5a3_b. Pentax vs Sony_c by gnarlydog, on Flickr

    I might be wrong but my calculations and comparisons to a M.Zuiko lens reveal that it is an approximate 50-66mm lens (field of view) with an aperture (T-stop) of f1.5-ish.
    To me the whole exercise is not so much in gaining a walk-around lens or a very sharp landscape one, but a proof of concept. Can any (most) lens be adapted to mirrorless? :inlove:

    I will post some images taken with that lens soon
     
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  2. eteless

    eteless Mu-43 All-Pro

    Jun 20, 2014
    Normally they have the f stop indicated on the front bezel holding the first element (it should have the zoom range then the fstop in 1:x.x-y.y format, for example the SE28A-2 would be "1.3x 1:1.7-2.1").
    I'm also a little surprised you could reach infinity with it, many projection lenses are designed such that they would be touching the sensor.

    I always love viewing your Frakenlenses, I love the creativity needed for the end solutions.
     
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  3. gnarlydog australia

    gnarlydog australia Mu-43 Top Veteran

    967
    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    First samples are in, from this afternoon at a horse jumping event. Nope, I didn't use that monster on the track but around the stables.

    28001538266_8869c54dea_b. Horse portrait_1_c by gnarlydog, on Flickr

    Focusing is a real bitch since the ring is right on the tip of that huge barrel and I need to extend my fingers to grab it and turn it while supporting the lens with my palm. Yes, I could use a monopod but that makes thing too cumbersome and slow for me as I walk around and like to drop low to get some angles.
    The lens is low contrast in harsh light with a distinctive glow. I think it would make a brilliant portrait lens, that's if I don't scare my subject with that objective front element of 80mm! :eek-31:
    My arms are just not used to hold that kind of heft anymore (SLR days) and I don't think it will be a very versatile lens as walkaround. :confused:

    27934208082_80a216dc38_b. Horse event_c by gnarlydog, on Flickr

    27756355580_29e431c462_b. Evening feed_c by gnarlydog, on Flickr
     
    Last edited: Jul 2, 2016
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  4. eteless

    eteless Mu-43 All-Pro

    Jun 20, 2014
    Really nice samples, the way highlights bloom reminds me a bit of film without an antihalation layer (especially in the second shot showing the sky between leaves).
     
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  5. gnarlydog australia

    gnarlydog australia Mu-43 Top Veteran

    967
    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    thank you for the comparison to film without antihalation layer (that is a big word for me :oops:)
    here is one that maybe shows it even more?

    27432722583_f07d1dd19e_b. Last clinging leaves_c by gnarlydog, on Flickr
     
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  6. Crdome

    Crdome Mu-43 Hall of Famer

    Sep 11, 2011
    West Central Indiana
    Chrome
    Sounds like you need a focusing oil filter wrench.
     
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  7. gnarlydog australia

    gnarlydog australia Mu-43 Top Veteran

    967
    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    where can I get one large enough? mining earthmoving equipment size ;)