Hi Guys,
I hope this post may inspire somebody to do the same.
Does the lens worth of time spent for its conversion. Who knows...as long as it brings fun and satisfaction and differentiation from the others, then why not!?
So, here it is step by step instruction with pictures.
Does it focus to infinity? You may ask. The answer is - Yes, it does and the aperture works too.
I bought a Topcon Unirex with 50/2 lens.
Unscrew the 3 screws, and remove the rings:
Then I filed and cut the base ring to which the UV mount on the Unirex was sit tp make in the way to be inserted inside the K-mount ring, that I took from Rikenon 50/2 lens. Then the UV mount base was attached to the K-mount as below. I think, instead of UV mount base, there could be taken a washer of a proper size. Here it is a look of the UV base ring with the K-mount. It was attached to the K-mount by two screw and glued by superglue.
As long as I took original base ring the UV bayonet was simply screwed to it by 3 original screws.
Then, everything was assembled together.
A couple of pictures:
Wide open (vignetting)
One stop down:
Wide open:
Wide open
Wide open
Bokeh: F2:
F2.8
F5.6
F11
F22
The closest distance to object is about 60 cm.
As long as I have an adapter I can use the other Topcor UV lenses, like 35, 53, 100, 200 and 400.
If you have questions, please do not hesitate to ask.