Avotius
Some guy
Hello again. Im going to try another stupid project, which is taking the lens from a yashica gsn and do the monkey thing with it and then stick it on the end of a ltm-m mount adapter so it will go on the end of an m mount camera.
Things that need to be done:
Get the lens off the gsn without breaking it
Figure out the distance that is needed from the rear element to the film plane
Figure out how to jam the shutter open on the lens (electronic copal shutter)
Figure out how to mount the lens to the adapter and avoid light leaks
If and when I need to, how to shim the lens
Figure out how to center the lens on the adapter correctly
A little brainstorming here, anyone else have any other thoughts about things I need to do, keep in mind, or anything?
I dont have a lathe or any other tools per say besides a couple jig saws, screw drivers, and whatnot, but im almost positive I can do this given my past success with mucking about.
Things that need to be done:
Get the lens off the gsn without breaking it
Figure out the distance that is needed from the rear element to the film plane
Figure out how to jam the shutter open on the lens (electronic copal shutter)
Figure out how to mount the lens to the adapter and avoid light leaks
If and when I need to, how to shim the lens
Figure out how to center the lens on the adapter correctly
A little brainstorming here, anyone else have any other thoughts about things I need to do, keep in mind, or anything?
I dont have a lathe or any other tools per say besides a couple jig saws, screw drivers, and whatnot, but im almost positive I can do this given my past success with mucking about.
Last edited:
reub2000
Established
Sounds crazy. I asume your doing this for fun, and not for anything serious, right?
FrankS
Registered User
You need to talk to Brian Sweeney here at RFF. He's the Dr. Henry Frankenstein of lenses.
Last edited:
mike_j
Established
I did this some time ago - see this thread.
http://www.rangefinderforum.com/forums/showthread.php?t=33882
It wasn't a great success, the result was never elegant or practical for serious use but I took a few pictures which were OK at infinity - a bit wrongly focussed at close range. Apart from stripping the shutter out your main problem, as you will see from the thread is removing some metal from the back of the lens assembly. I have a decent model engineering workshop and found it tricky. No doubt if I had spent a lot more time and effort a better job could have be made but the lens will still look very odd - frankly it's not really worth the effort.
Good luck - let us know how you get on.
http://www.rangefinderforum.com/forums/showthread.php?t=33882
It wasn't a great success, the result was never elegant or practical for serious use but I took a few pictures which were OK at infinity - a bit wrongly focussed at close range. Apart from stripping the shutter out your main problem, as you will see from the thread is removing some metal from the back of the lens assembly. I have a decent model engineering workshop and found it tricky. No doubt if I had spent a lot more time and effort a better job could have be made but the lens will still look very odd - frankly it's not really worth the effort.
Good luck - let us know how you get on.
