Lilserenity
Well-known
I have been having problems with my Voigtlander Color Skopar 35mm f/2.5 lens with focussing tab that broke off. I did at first think I had fixed it with Araldite but then it broke off again, I reattached it, and it failed again.
I fatefully decited to take it apart to try and attach the tab back but from the inside with Araldite. A fine principal.
However not only could I get the focussing ring off the lens barrel itself, but in trying to put back together I basically made a mess of it so that apparently a minimum and infinity distances it didn't appear to be focussed correctly. Certainly at infinity it was off for objects in the distance.
So over the past few days I have tried to get it to work again, I think I finally cracked it so that infinity appears to be focussed at infinity and the min. focus distance seems to equal (at a guess) the minimum focus distance in the rangefinder. (I'm using a Leica M2 and haven't touched its rangefinder as I know it's fine)
My question is, apart from shooting a roll of film, is there any other way of checking the lens is correctly focussed at infinity besides what I have already done?
I expect the answer to be: you need to shoot a test roll
If so I'll do so, but I have purchased a brand new Ultron 35mm from Robert White so I anticipate selling the Skopar on the understanding to the buyer that my focussing tab repair may not hold and they made need to get it fixed properly. I basically want to make sure that the lens is otherwise working fine again bar the likelihood of the foucussing tab coming away again... (It was the first case Robert White have ever heard of as well apparently)
I fatefully decited to take it apart to try and attach the tab back but from the inside with Araldite. A fine principal.
However not only could I get the focussing ring off the lens barrel itself, but in trying to put back together I basically made a mess of it so that apparently a minimum and infinity distances it didn't appear to be focussed correctly. Certainly at infinity it was off for objects in the distance.
So over the past few days I have tried to get it to work again, I think I finally cracked it so that infinity appears to be focussed at infinity and the min. focus distance seems to equal (at a guess) the minimum focus distance in the rangefinder. (I'm using a Leica M2 and haven't touched its rangefinder as I know it's fine)
My question is, apart from shooting a roll of film, is there any other way of checking the lens is correctly focussed at infinity besides what I have already done?
I expect the answer to be: you need to shoot a test roll
If so I'll do so, but I have purchased a brand new Ultron 35mm from Robert White so I anticipate selling the Skopar on the understanding to the buyer that my focussing tab repair may not hold and they made need to get it fixed properly. I basically want to make sure that the lens is otherwise working fine again bar the likelihood of the foucussing tab coming away again...
(It was the first case Robert White have ever heard of as well apparently)Bassism
Well-known
You can put a piece of ground glass on the film gate and check the focus there.
An easy way to make a "ground glass" is to use any suitably sized piece of glass (maybe an old microscope slide?) covered with frosted tape.
An easy way to make a "ground glass" is to use any suitably sized piece of glass (maybe an old microscope slide?) covered with frosted tape.