Zeiss Ikonta B
(Pre War)
Rangefinder
Prisms Out of Adjustment
Problem:
Camera produces sharp exposures when focused at known distances using
the lens distance scale as a guide.
When using the rangefinder to attempt focus, the setting is off a
consistent amount at each distance.
* Caution!! If the
amount of error in the rangefinder is large and not consistent
throughout all distances, the below procedure will not probably not
resolve the problem. See
"Rangefinder Prisms Out of Adjustment" for such problems.
* Caution!! Be sure
the shutter is not cocked.
Set the focus on the lens to infinity.
Set the shutter speed to B.
* Caution!! Have the
proper small screwdrivers before attempting this repair.
Use a tray, such as a TV tray, with a white towel placed in the
tray. Remove all parts from
the camera over this tray so any small pieces can be caught & seen if
dropped!
* Caution!! Be sure
you know how your camera is mis-aligned before beginning repair!
Example: Does it indicate a focus of 15 meters when in reality
the distance is 8 meters.
* Caution!! Caution!! If you do not have familiarity with small mechanical items and a lot of patience, do NOT attempt this repair! Please read through this entire article before attempting, and then make the decision whether to proceed at your own risk! I am NOT a camera repair man. I was in a position where I had trouble finding anyone I would trust that was willing to work on my camera and talked to some who had bad experiences with others attempting repair on their Zeiss camera.
--The following assumes that the camera front lens elements are in the
correct helical. You either need a ground glass to check this or
already have exposures from known distances while the lens was set to
those distances. If the photos are tack sharp, the elements should
be correct.
--Facing camera lens, remove the small screw at 4 O’clock & the other at
8 O’clock on the black face plate.
--Facing camera lens and looking down onto the top of the lens, remove
two screws at 12 O’clock on the top of the black face plate.
*When working the gears they may appear loose or bind.
This is probably because the face plate is removed and nothing is
holding the large gear that surrounds the lens flat.
--With the lens still at infinity and the camera on its back, remove the
two screws from the brass plate holding the prisms in place. Carefully
lift the plate away.With this plate removed you can freely move either
the front or back prism.* Caution!! If you turn the camera, these two
prisms will fall out. (This is why you marked them initially!)
--To do this remove the prisms so they will not fall out of the camera.
Remove any prism gears that may fall out.
--If you were unable to get the prisms to focus correctly, you will
have to adjust both the back and front prisms.
--Once focus testing is successful, replace the screws that hold
on the front plate and you should now have a correctly focusing Zeiss
rangefinder camera.
I am not sure if this procedure will work with Zeiss rangefinder
cameras other than the 532/16 Super Ikonta B.
I wish to thank Mike Elek who provided initial detailed
information and suggestions for this repair.
I would also like to thank Austin Franklin for the information he
provided. Good Luck.