Gallo
Member
Hi, folks, I`ve just purchased a used Bessa R4a and 21 f4 color skopar (LTM) at KEH, and later bought an adapter ring here in Argentina, where I am from. When I screw the lens I noticed that the white dots do not align in what the "correct" position should be.
I also feel that rangefinder patch does not move between the 0.5 and 0.8 focus range.
Are these problems with the adapter ring? I hope I`m not dealing with a RF misalingment cause repairing it here would be difficult.
I post three pics here. Two of the lens attached to the camera to show more clearly what I`m talking about, and a third of the adapter ring. Maybe I bought the wrong one.
Many thanks in advance!!!!!
I also feel that rangefinder patch does not move between the 0.5 and 0.8 focus range.
Are these problems with the adapter ring? I hope I`m not dealing with a RF misalingment cause repairing it here would be difficult.
I post three pics here. Two of the lens attached to the camera to show more clearly what I`m talking about, and a third of the adapter ring. Maybe I bought the wrong one.
Many thanks in advance!!!!!
Last edited:
zeroeseight
Registered User
I have a couple of screw adapters and lens and none of them line up perfectly on mine. I don't think it is critical in terms of affecting optical performance. Also I have the voigtlander 25mm that focuses to 0.5m, like yours it doesn't couple the rangefinder under 0.7m.
Gallo
Member
Ok, so that should not affect focus on the prints? At least critically? I`m still new to RF with interchangeable lenses, so I`m a little lost...
Thanks, zeroeseight!
Thanks, zeroeseight!
ruby.monkey
Veteran
It's normal for screw-mount lenses not to line up with the adapters' centre marks. They should still focus correctly. The lens itself is RF-coupled down to 70cm (if the body allows this), but scale focusses as close as 50cm.
What you describe sounds normal, but you should run a roll of film through the combo to make sure.
What you describe sounds normal, but you should run a roll of film through the combo to make sure.
Gallo
Member
Thanks, Ruby for your advice! I´ll check tomorrow with a roll of film!
Krosya
Konicaze
One I'm selling right now in Classifieds does the same thing and I tried 6 different adapters - Leica, Voigtlander, etc and it does it with either one of them. As far as I used it and can tell from the results - it doesnt affect anything at all when it comes to image quality or lens mechanics/camera fit. :
Leigh Youdale
Well-known
A couple of my lenses show a similar thing, although not as marked as the one shown in the OP's photos. Haven't detected any focus problems with my own Bessas. My thoughts (assumption) are that any small difference in the starting point of the thread cutting in the adaptor can lead to this type of offset but as long as the thread is cut to specification and the adaptor is the correct thickness and the lens is screwed into it properly then the lens to film distance should be correct. All but one of my adaptors are Voigtlander - other manufacturers might experience some variation in the machining that allows the thread to start at a slightly different position - one or two degrees would be all it would take.
Gallo
Member
So, it seems to be a common issue. I shot a roll this week, so we will see what goes on when developed...