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Showcase Transplanted fixed lens: Rikenon 40mm f2.8

Discussion in 'Adapted Lens Sample Image Showcase' started by gnarlydog australia, Mar 7, 2016.

  1. gnarlydog australia

    gnarlydog australia Mu-43 Top Veteran

    978
    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    After my somewhat successful Frankelens #1 I wanted a slightly easier lens to hack.
    I decided on the rangefinder film camera Ricoh 35ZF with a fixed Rikenon 40mm f2.8
    The transplant was to be much easier than from a camera that has auto focus, the Rikenon is a self contained manual lens with focus helicoid and aperture.
    195435253_0c1b722a84_z. ricoh0115 by kris, on Flickr

    Disassembling the camera and removing the lens was relatively easy; the lens is mounted on a board.

    25466896322_679619374e_c. Lens assembly_c by gnarlydog, on Flickr

    I removed the board. On the rear of the lens I found the shutter mechanism.

    25466970862_23a251dd61_c. Separating shutter mechanism_c by gnarlydog, on Flickr

    There is no need to keep the shutter cogs and levers which could hinder possibly the install of an adapter. I removed the unnecessary bits.

    25466961952_afd45f25db_c. Shutter cogs_c by gnarlydog, on Flickr

    25466952622_feb4844116_c. Shutter removed_c by gnarlydog, on Flickr

    Once the lens was stripped of the superfluous material I used a 52mm UV filter ring (glass removed) to create a collar around the base of the original lens as it looked a bit raw.
    The lens needed to be spaced about 7.5mm further away from a C-mount adapter; I created that distance by stacking two 46mm UV filter rings (glass removed) and a bit of shaving (sandpaper on a flat surface, ring sanded in circular motions, keeping it even).
    The 46mm fitted
    perfectly around the base of the lens while the 52 slipped over (with just a bit of enlargement of the bore)

    25559405506_7795836834_c. Rikenon 40mm adapter to M43_c by gnarlydog, on Flickr

    After checking that I had perfect infinity (many trials while slowly sanding away the ring) I glued the rings with epoxy (JB Weld) making sure that the 52mm would be attached to the aperture ring, while the 46mm just to back (base) of the lens.
    The shutter no longer serves a purpose so I covered the marking on the lens with high grade decal.

    25467131332_57cebf04de_c. Rikenon 40mm on E-P5_side_c by gnarlydog, on Flickr

    24958813473_56ccac8d93_z. Rikenon 40mm on E-P5_c by gnarlydog, on Flickr

    Sample images to follow soon.
     
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  2. pellicle

    pellicle Mu-43 All-Pro

    Feb 10, 2010
    Southport, OzTrailEYa
    pellicle
  3. gnarlydog australia

    gnarlydog australia Mu-43 Top Veteran

    978
    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
  4. acnomad

    acnomad Mu-43 Veteran

    284
    Jan 5, 2016
    Andy
    Thanks for sharing these steps. Very fun. Looking forward to seeing the images!
     
  5. gnarlydog australia

    gnarlydog australia Mu-43 Top Veteran

    978
    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    first sample images taken this afternoon... well, I hoping for better :flypig:
    OOC, no process; first one shot wide open, second at f5.6

    25239695689_07793f0ee2_b. Rikenon 40mm f2.8 wide open by gnarlydog, on Flickr

    25581100666_332ce63fea_b. Rikenon 40mm F2.8 @f5.6 by gnarlydog, on Flickr

    I can see the aperture made up only of 4 blades: square highlight in the bokeh :confused:


    24976791214_a1f7ee3768_b. JX1f2.8 by gnarlydog, on Flickr
    shocking flare in this very hard lighting

    25514579201_c0e1a6d411_b. JX1f5.6 by gnarlydog, on Flickr


    so, while I was there I wanted to see how it compares to the Zuiko PEN-F 38mm f1.8

    25514681031_d2dd0810fe_z. Zuiko vs Rikenon by gnarlydog, on Flickr
    .... I think I will have to take a good second look at that Zuiko glass again and give it a fairer go, coz it ain't bad, at all :doh:

    OOC with F.Zuiko 38mm f1.8 @f2.8

    25239993739_24172f3e63_b. F.Zuiko 38mm f1.8 @f2.8 by gnarlydog, on Flickr
     
    Last edited: Mar 8, 2016
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  6. Ulfric M Douglas

    Ulfric M Douglas Mu-43 Hall of Famer

    Mar 6, 2010
    Northumberland
    Great idea to use empty filter rings as spacers and collars.
    I shall remember that!
    (I built up areas with epoxy putty but it isn't neat)
     
  7. gnarlydog australia

    gnarlydog australia Mu-43 Top Veteran

    978
    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    for my bigger "adapters" (spacer needed to correct flange distance differences) I use often M42 extension rings for macro work. A set of 4 rings of different lengths sells for less than $10 on eBay. If I really want to go ghetto (but still fully functional) I use PVC plumbing tubing. And of course all bonded with the magic glue of JB Weld (or any thickened epoxy).
    As long as I am carefully measuring with calipers while cutting and shaving to keep the spacers of perfect round thickness (not one side shorter) I get great results. I do often prefer the DIY spacer adapters to some factory bought one since infinity focus is not always guaranteed to be where the markings on the lens are.
     
  8. Gerard

    Gerard Mu-43 All-Pro

    May 12, 2015
    Vleuten, Utrecht
    Nice to follow your steps. Even less than 43 steps!
     
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  9. gnarlydog australia

    gnarlydog australia Mu-43 Top Veteran

    978
    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    yeah, I initially I thought of showing every single screw location and disassembly... but who was I fooling: it was often a brute approach of tearing the thing apart... it's not like I was going to put it back together later ;)
    I thought I will just show enough crucial bits to maybe spark somebody's else interest. I often see end results but rarely in-between step to motivate me or educate me.
     
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