We apparently talked to different people at C@non.
The person with whom I spoke is at the service department in New
Jersey. He made it very clear that the only way they could guarantee
that lenses work with bodies is to calibrate them at the same time.
He said either could be checked individually to make sure it met
specs, but ideally they need to be checked together. Perhaps he was
speaking out of school rather than toting the official line.
The issue is one of tolerances. If the lens is at one end of the
curve and the body at the other, back or front focus is the logical
result.
A couple members of the Fred Miranda forum ended up sending their
entire kits to C@non to make sure everything was calibrated together
and reported distinct improvement in performance. They were pros and
could justify the several hundred dollars expended as part of the cost
of doing business. One even told me he intended to send all his gear
in annually. Likened it to maintaining his car.
I think this is generally a non-issue for mechanically focused cameras
because the photographer makes the decisions about correct focus
rather than electronics. As long as the focusing elements of the
camera are correctly adjusted, what you see is what you get. Years
ago I had an SLR the never seemed quite right. Had it serviced and it
turned out the mirror needed a tiny adjustment. After that, focus was
dead on with any lens I used.
YMMV/ScottGee1
On 3/27/07, Johnny Johnson <jjohnso4@xxxxxxxxxx> wrote:
>
> At 12:53 PM 3/27/2007, ScottGee1 wrote:
>
> >And oh, by coincidence bodies and lenses often need to be calibrated
> >to each other in order to auto-focus accurately.
>
> But, according to Canon, they don't calibrate bodies and lenses to
> each other. Even if you send the two in together for calibration
> they are calibrated independently to their own standard.
>
> I wonder who really does calibrate a given lens and body
> together. Sure does seem like asking for problems when you add
> another lens to your collection even though it might be in perfect
> calibration.
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