How to calibrate the rangefilder (Zorki-C)?

[bresticus]

Hi, I got my Zorki-C from moscowstore a few weeks ago, and I noticed that when focusing on a very distant object with the maximum "infinity" position (on the lens), I still have a subtle difference between the two images in the ranfefinder.
Should I calibrate it myself with a screwdriver? Am I right by assuming that the involved screw is the litle screw near the "square" window in front of the camera? How should I do? Is there something I have to take care of?

 

[Penny Lane]

Infinity calibration is done with a tiny screw behind the screw next to the square VF window. Turn the screw in the direction you want the ghost image to move. Mind that you don't lose the cover screw.

If you're going to recalibrate the rangefinder, check it at 1m as well by setting up a target at 1m from the film plane. This isn't very convenient with a bottom loading camera, but looking into the camera from the bottom you can get a decent guesstimate of where the film plane is and work from there. If it's good, simply adjust infinity.

If it's off at 1m as well, you'll have to adjust the RF sensor arm tip by turning it very slightly one way or another (I stupidly keep forgetting which way for which adjustment direction); You can use a pair of tape-covered needle-nose pliers to do this.

Jay Javier has an article on the procedure over here.

 

[wolves3012]

There is also the sticky in our own forum:
http://www.rangefinderforum.com/forums/showthread.php?t=73900

 

[Penny Lane]

And there's indeed that 😀

Derk