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Homemade lenses for my G1
Old 04-05-2012   #1
petronius
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Homemade lenses for my G1

Minotar 35mm/2,8 from a broken Minox 35EL, glued into a m4/3 body cap:



Examples; ooc jpgs, AWB, Auto ISO, dynamic film mode, minor corrections in PS:

f8,0:


f2,8:


f5,6:
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Old 04-05-2012   #2
paulfish4570
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wow. aren't you a wiz ...
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Old 04-05-2012   #3
gshybrid
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interesting... does it focus at the distances marked on the lens?
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Old 04-05-2012   #4
petronius
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Yes, it does!
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Old 04-05-2012   #5
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Great idea, I've got a broken Minox -- how did you calculate where to fix the lens? How is the leather grip attached and how far round does it go?
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Old 04-05-2012   #6
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I used the trial and error method. The lens comes out of the Minox in two parts, the glass with shutter, aperture and distance scale and a straight tube. There are many wires to cut and you will have to remove the shutter magnets and some other gizmos on the back of the lens.
(The tiny lever that opens the shutter blades has to be glued carefully.)
I carved a hole in the body cap in which the tube sits firmly. Then I set the lens to infinity, put it into the tube and moved the whole unit carefully until I had a sharp image on the lcd. Then I removed the lens and glued the tube into the body cap without moving it. After one night I put the lens unit back into the tube and fixed it from inside with gaffer tape to keep the lens removable if necessary (Im a friend of gaffer tape).
The leather on the camera body is fixed with rubber cement (Pattex). It end at the hinge of the SD card door.
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Old 04-05-2012   #7
petronius
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26mm/2,0 lens removed from a Canon 110ED and transplanted into a Industar-61 helicoid:


I wrapped gaffer tape around the lens to fit the different diameters of the lens and the helicoid.

The Canons aperture was placed in front of the lens, so I can shoot only at 2,0; the lens focuses from 25cm to infinity.





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Old 04-05-2012   #8
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Quote:
Originally Posted by petronius View Post
I used the trial and error method. The lens comes out of the Minox in two parts, the glass with shutter, aperture and distance scale and a straight tube. There are many wires to cut and you will have to remove the shutter magnets and some other gizmos on the back of the lens.
....
.
Thanks, that's very helpful!
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Old 04-05-2012   #9
kzphoto
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That canon 110 ED lens is cracking! Amazing bokeh. It wouldn't cover an APS-C frame would it? That would be a really great focal length to employ on an NEX or Ricoh GXR....
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Old 04-05-2012   #10
petronius
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It was designed for 13x17mm negatives; I presume some vignetting on a Nex.
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Old 04-05-2012   #11
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fun thread, zeno ...
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Old 04-05-2012   #12
petronius
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Thank you, Paul!

Here is another one. In 2010 I bought a Penti I with a brick of Orwo SL films. I took it on a walk some weeks ago and after the first frame the shutter stuck and something rattled inside the camera. Ever tried to open a Penti? Forget it! (Maybe Im too dumb, but I read about similar problems with the Pentina)
At the end I used some force, and removed the lens. Looking around in my McGyver box I found the seldom used Holga lens for M4/3, which I had modified several times. I removed the "lens" and replaced it by the Penti glass. The new lens can be stopped down, but I have to do it from the backside with a toothpick or a pen.



Examples:





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