Reason for so many focus errors we see today?

"RichA" wrote in message
...
Plastic? Thermal expansion of plastic is much greater than metal and
it could very well be why we are seeing focus issues that need "lens
re-calibration" at service depots or that we see the need for in-
camera focus fine-tuning. Even cameras and lenses that appear to be
metal today may have plastic cells holding lenses, components in
cameras. The cameras are produced in a control temp environment but
that isn't real life use where temps can vary by 10's of degrees. I
don't remember all metal AF SLRs needing focus fine-tuning (or having
that facility) in the film days.

You mean like with Canon D1's and L glass, cos they all have this problem?

Sometimes Rich even I think you are an idiot.