januaryman
"Flim? You want flim?"
I'll write that down, but please, for those of us who are engineerically challenged, what does that mean? I get lost in these terms rather easily, I fear. "full-barrel cam" just blew the top of my head off.
rxmd
May contain traces of nut
The rangefinder cam is the part on the back of the lens that moves in and out as you focus. A rangefinder arm at the top of the lens mount picks up this motion and relays it to the camera's rangefinder system.
Full-barrel cam means that this cam has the shape of a ring that goes all round the barrel of the lens. This is what you normally have in FSU lenses.
A tongue-shaped cam is what you get in some Canon lenses, for example. Here the rangefinder cam only is a narrow tongue and does not go around all the way around the barrel. When you mount such a lens onto the camera, the tongue goes in a circular motion as you screw in the lens. Since on (most) FSU cameras the rangefinder coupling arm does not have a little roller at the tip, but a teardrop-shaped wedge of sorts, at some point the wedge will jam against one side of this tongue-shaped cam.
There's a good illustration on Jay's FED/Zorki site (I hope it's OK to post an image link to the picture):
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januaryman
"Flim? You want flim?"
Thanks for the excellent explanation,rxmd. I'm glad to know, but as far as the mechanics go, and repairs and adjustments... I leave it to the pro's.
Pepe
Established
The serenar arrived. I'll post pics later.
It IS coupled, good news. It's also the most beautiful 50+ year old thing I've had the pleasure of holding (yes that includes my mother, but only I am allowed to say that). Both the metal ad th eglass look perfectly new to me...
It came in an original leather tube, with the viewfinder (beautiful, but I can't see the entire frame even without glasses) and both caps.
I am, however, afraid to mount it on my FED 2 for the above mentioned reasons..... So I'll wait until I'm near the end of my roll.
It IS coupled, good news. It's also the most beautiful 50+ year old thing I've had the pleasure of holding (yes that includes my mother, but only I am allowed to say that). Both the metal ad th eglass look perfectly new to me...
It came in an original leather tube, with the viewfinder (beautiful, but I can't see the entire frame even without glasses) and both caps.
I am, however, afraid to mount it on my FED 2 for the above mentioned reasons..... So I'll wait until I'm near the end of my roll.