Hi Hans
Couple of comments on your questions:
> 1. The display of my 2 S does not reproduce alterations of every 1/3-stop
> when using the plus-minus-dial; the first 1/3 sometimes none, the second
> 1/3 stop gives some alteration of the dial, sometimes one, sometimes the
> given two 1/3s at a time.
> Is this a ?normal" abnormalty for this type?
This also occurred to my OM-4 & 4Ti after having a CLA done on each. Prior
to that, as the compensation dial was adjusted, the result could be seen on
the LCD in the viewfinder. I also sent the cameras back to be checked, but
they came back just the same, with a note to the effect that the
compensation was working normally. I then got radical and put some slide
film (K'chrome 64) in the cameras and tested the compensation very
carefully with some test shots, from normal exposure to plus & minus 2
stops in 1/3 increments. On the slides from both cameras, the 1/3
increments could all be clearly seen, proving that the compensation was
working normally, even though the display did not appear to operate as
expected.
> 2. Spot or cw-mode - another but only technical aspect: My OM Ti
> announces usually 1/3 stop lower in spot-mode than in CW-mode (in Auto as
> well as manual), of course metering an absolutely even lighted object
> (wall f.e.).
I have a similar problem which I am still trying to deal with. Both my
OM-4 & 4Ti, display the exact same speed for the spot reading as for the
average reading (given an absolutely evenly lit wall), but in practice, the
auto (averaging) mode overexposes compared with the spot or manual mode, by
around 1/2 to 2/3 of a stop. With a piece of film in the camera, this
difference can easily be heard on the low speeds, eg when the display
indicates 1/2 second, the shutter speed sounds closer to 1 second. I have
tried lots of test photos of subjects where the whole scene is close to 18%
grey, and each time the auto overexposes compared to the spot or manual
mode, even though the display indicates the same speed is selected. (No
change to aperture.) The problem is consistent irrespective of which lens
or aperture is used.
To get around it when using normal auto mode, I set the compensation dial
to -1/3 or -2/3, depending on the situation. Problem then is that I often
forget to switch off the compensation prior to using spot or manual. Very
frustrating.
The technicians around here say this is normal; - spot and average should
be different. I don't agree as I didn't have this problem prior to the
CLA. I have heard that the auto average mode is easy to adjust.
Apparently, there are 2 potentiometers under the bottom plate of the
mirror box. The rear-most one is supposedly the one for the auto mode
shutter duration. (I think the front one is the adjustment for manual
shutter speeds.) I have no problem with performing the adjustment as I am
an trained in electronics and frequently perform adjustments via preset
pots. The problem is getting to the pot in question. The bottom plate of
the mirror box is glued into place. It appears to consist of 2 pieces, & I
am not sure how to remove it (or them) without causing damage to these
parts. Even if I knew how to remove them, I am not sure what type of
adhesive is required to refit them. If anyone can shed any light on this it
would be welcome.
If I lived in the US, I would ship the cameras to John H. From past
experience with repair technicians in my area, I am not inclined to trust
them to fix this problem without inflicting some other problem.
I find it frustrating that the potential metering excellence of these
cameras cannot always be realised because it is so hard to find someone who
can calibrate then correctly.
Regards
Ross Waite
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