http://www.alunfoto.no/temp/heligontest/index.html
I have purchased an old optic from an X-ray machine, a Rodenstock 100mm
f/1.6.
First I tried it on the 645D, just holding it before the bayonet to see if
there was any vignetting. There wasn't! So the image circle is quite decent.
The image of the rotten plant is shot with this combo. I think the OOF
rendering is quite interesting and look forward to play more with this
setup.
Then I scavenged an old and broken Pentax-A 50mm f/1.7. I picked out all the
optical elements and mounted the Rodenstock into the focusing helicoid using
generous amounts of gaffatape. The other two images are produced with this
setup. The "jesus-light" image at f/2.8, the daisies at f/8.
To have the iris behind all the optical elements like this is probably all
wrong from a theoretical perspective, and the true size of the aperture is
probably not as advertised. Yet I must say I like the results.
As the "jesus-light" image shows, the lens comes with an odd compliment of
internal reflections. I believe it can be used to good effect on occasion.
Cheers,
Jostein
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