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Showcase "Frankenlens" Pentax/KP16 50mm f1.2

Discussion in 'Adapted Lens Sample Image Showcase' started by gnarlydog australia, Oct 10, 2016.

  1. gnarlydog australia

    gnarlydog australia Mu-43 Top Veteran

    973
    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    I love the look that some 50mm f1.2 lenses give, with the quirky half-moon bokeh bubbles.
    Unfortunately most vintage SLR lenses in that category command a hefty price, worthy of some decent native glass. Finding one in good shape without spending a fortune proved impossible.
    What intrigued me while browsing evilBay was the regular offer for Russian projection lens KP-16 in 50mm with a bright aperture of f1.2
    My previous experience with a projection lens 50mm f1.2 was not good: back focus for infinity was something like 12mm therefore not usable on Micro 4/3. I could only focus on subjects at exactly 30cm with extremely shallow depth of field... not very useful.
    Lucky enough one seller described exactly the dimension of the lens and distances of the rear element and back focus distance for infinity.
    Images were accurate enough that I was 51% confident (I am a glass half-full kind of guy ;)) that I would be able to modify and cut away enough barrel to make it work...
    $28 and 3 weeks wait to arrive from Ukraine, in mint condition, factory boxed.

    Here I need to document what I did to refit that lens (edit 12OCT: now with images).
    I cut the excess on the rear of the barrel down to the glass element to allow the lens go closer to the sensor. I initially used bellows to determine rough distance needed and sample images were promising enough to continue with the project:dance4:

    I had an old Pentax SMC 50mm f2.0 lens with its glass totally shot: moldy and scratched. I bought that lens for $5 for future projects. With the glass removed I disassemble the aperture mechanism and the removed the rear interface of the lens to glue (JB Weld) a C-mount to M4/3 adapter so the lens would sit as close as possible to the sensor.
    29648338964_d8f872420c_b. KP-16 refitted to M43_c by gnarlydog, on Flickr

    The Russian optical block was then inserted into the barrel and there were a few mm wiggle room. Luck had it that a step-down filter adapter of 49mm to 46mm would allow the lens to be mounted very snugly. The 49mm sits right at the end of the Pentax barrel, just where one would screw-on a filter. I pushed/pulled the projection lens in-out to get perfect distance for infinity, measured all sides for precisely alignment (to get it square, important!)
    A bit of glue secured the lens in place.
    30244255986_57df2f7601_b. KP-16 refitted components_c by gnarlydog, on Flickr

    There is not enough room to have an adjustable aperture on the rear so the lens can be used only wide open at f1.2
    Of course this lens is not intended as "general purpose" one (I have plenty of those) but as a dedicated shallow depth of field, speckled highlights bokeh, fast low-light one.
    Here are some sample images.

    29603846174_9ac2e059c9_b. DV081009 by gnarlydog, on Flickr

    30209619555_c94eb24c69_b. 16KP projection f1.2 by gnarlydog, on Flickr

    30148626771_2b4ba86754_b. DV081029 by gnarlydog, on Flickr

    29913632720_a018569414_b. Van on KP16_c by gnarlydog, on Flickr
     
    Last edited: Oct 13, 2016
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  2. Ulfric M Douglas

    Ulfric M Douglas Mu-43 Hall of Famer

    Mar 6, 2010
    Northumberland
    Excuse me but there's no picture of the LENS ... yet.

    Now there is!! :bravo-009:
     
    Last edited: Oct 13, 2016
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  3. Giiba

    Giiba Something to someone somewhere

    273
    Aug 19, 2016
    Burnaby, BC
    I agree, pics look good but we need a pic of Franken lens... or it didn't happen! :biggrin:
     
  4. gnarlydog australia

    gnarlydog australia Mu-43 Top Veteran

    973
    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    OK OK, I was busy playing with the lens and have not had time to photograph it yet. Coming soon, just like the Olympus E-M1mk2 ;)
    Here is how it looks like, naked

    USSR-Russian-PO-109-1A-16-12-50-50mm-f12.
     

    Attached Files:

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  5. Nathanael

    Nathanael Mu-43 Veteran

    380
    Oct 12, 2015
    dang.. the results are pretty impressive. interested to see the lens
     
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  6. gnarlydog australia

    gnarlydog australia Mu-43 Top Veteran

    973
    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
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  7. JamesD172

    JamesD172 Mu-43 Regular

    91
    Aug 18, 2016
    James Dolezal
    Wow, that is some beautiful bokeh!

    I'm in the same camp of really appreciating the 50mm f/1.2 look, but not being able to justify spending that much money on vintage glass. Bummer I don't have the technical capabilities to take the route you did. :p
     
  8. gnarlydog australia

    gnarlydog australia Mu-43 Top Veteran

    973
    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    so far I had more success with that lens at closer subjects where the focusing is not so critical
    It does a wonderful job at rendering out of focus areas into bubbly bokeh
    crosspost on flowers
    30298904086_1859d616c1_h. bokeh of KP-16_c by gnarlydog, on Flickr

    30037853050_e42ef276f7_b. Van ambushing_bw_c by gnarlydog, on Flickr
     
    Last edited: Oct 15, 2016
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  9. gnarlydog australia

    gnarlydog australia Mu-43 Top Veteran

    973
    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    a few more portraits

    30288934550_6c27eff015_b. Peter on KP-16_c by gnarlydog, on Flickr

    30500346661_3741053479_b. Andrey on KP-16_c by gnarlydog, on Flickr
     
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