John Hudson wrote:
What I think has happened is that the linkage between the exposure information
shown in the viewfinder does not match the actual shutter speed.
That is the conclusion I reached, as well. As Sherlock said
(paraphrased), 'When we have eliminated the impossible, whatever
remains, no matter how improbable, must be the truth.' The only
explanation that fits all the facts is that the shutter speed
setting/readout is not the actual speed of the shutter. Although you
have documented a great many details, one isn't clear. You refer to the
"exposure information shown in the viewfinder". Does the speed shown in
the viewfinder agree with the speed set on the shutter speed ring? If
not, there is a linkage problem that clearly requires the shop to redo
their work. If not, the mistracking is elsewhere. Since it is consistent
across light levels, it is likely a misadjusted mechanical linkage or
potentiometer. Perhaps something that got bumped in reassembly.
The suggestion Piers made of taking documented flash shots in Manual
Mode shots at speeds above and below 1/60 is interesting. I believe the
4T won't fire a flash above 1/60 sec (except the F280). Without knowing
whether that is based on real or indicated speed, test shots could be
confusing to interpret.
Have you tried shooting comparison shots at manual 1/60 and at the
special mechanical red 1/60 down next to 'B'? If exposures are obviously
different, you have proof that the indicated and actual shutter speeds
are different.
Moose
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