Which lenses get stuck on Fed/Zorki bodies?

[itf]

I just read the thread about selecting an FSU body and I'm wondering which lenses get stuck on the Fed and Zorki bodies. More specifically; will my CV 28/3.5 get stuck on a Fed 2?

Cheers,
rich

 

[wolves3012]

Lenses only get permanently stuck on a bottom-loading body, which the FED 2 is not. If the lens doesn't have a tubular rf cam on it then it may become trapped until you remove the back to release the RF sensor (end of film!). I have no idea if the lens you mention falls into the category, just take a look at the RF cam. If it's a part-circle then best not to use it.

 

[ray*j*gun]

Be careful of Canon's some (my 135) have the non-tubular focus cam and I cannot use the Canon on my Fed or Zorki.

Ray

 

[payasam]

Watch out for the Summaron 35/3.5.

 

[xayraa33]

any lens with a tongue type focus cam, usually found on the non FSU longer focal length lenses should not be used on rf FSU LTM cameras.

 

[ZorkiKat]

See this post, from 10-16-2006.

http://www.rangefinderforum.com/forums/newreply.php?do=newreply&p=395845

Aurelius, I have used my Summaron on a friend's Zorki without trouble. Its RF cam is not a tongue but a full circle.

In some intances this is possible, but its better to err on the side of safety.

The Summaron does have a full barrel coupler. Its not the coupler which causes the trouble, but its the notch in its mount. If this notch lines up (in most cases with FED or Zorki, in cameras with correctly oriented mounts, it would) with the sensor tip, it could spell trouble.

The sensor will not catch if its orientation isn't too steep. In some cases the sensor will be oriented with its gently curved side facing out. How the sensor is oriented depends on the construction of the camera's rangefinder. The sensor tip's orientation determines the ability of the rangefinder to measure accurately at close distances- it cannot just be arbitrarily positioned to accomodate just any lens. Here is an example of one camera whose sensor tip is gently sloped- and it can accomodate the Summaron:

The FED-1 used a tiny tear-drop sensor tip. Its shape is very conducive for catching and hooking into things. Just imagine how nicely it will go into the notch of the Summaron 35:

And here is an example where the rangefinder demanded that the sensor tip be oriented so that its sensor tip be sharply sloped. Yes, the Summaron got caught in this one. Lens removal wasn't much of an incident since the camera, a FED-2, had an opening back. The shutter was opened and the RF arm was pulled back to allow the lens to be unscrewed from the mount. A caught lens, if unscrewed with some force will probably turn. It will probably cause the RF sensor tip to move a bit. The sensor tip is pivoted so it can be moved for adjustments. But once it moves, its calibration is upset and will need recalibration.

It's quite easy to see- any lens whose RF coupling cam (the doo-hickey which moves in and out as the lens is focused and 'couples' with the camera's focus sensor tip) is not barrel shaped - more like tongues- will NOT be safe to use on FED and Zorki.

Any lens whose RF coupling cam is full-barrel shaped is safe to use. All Soviet lenses made for FED and Zorki had full barrel cams.

BTW, I can presume from comments that the advice I gave years ago went unheeded- it appears that some have actually mounted lenses known to mess up and mesh with FED or Zorki focus followers and found themselves exactly at the situation described in the warnings....

 

[ZorkiKat]

And to show the different 'coupling cams' on lenses:

The tongue shaped cam found on the Canon will catch on the RF sensors of the Zorki and FED. The Elmar 9cm and Jupiter-9 cams on the other hand spans the full barrel diameter.

 

[payasam]

When I wanted a Zorki 1 as a companion body to my IIIc, I asked Oleg K. if he could sell me one which would take my Summaron without trouble. He went through the bodies he had and selected a 1C for me. For as long as I had it and the Summaron, they worked perfectly together.