[OM] Doing the Splits

[usher99]

AG writes:
"Of course, I must acknowledge the elephant in the room. Calibration
accuracy of the focus system in the OM-3Ti is probably not that good
and you also run into the issue of film flatness. But those are issues
outside of the discussion regardling human abilities."

Thanks for that whole excercise.  I wonder how much of an issue the 
calibration actually is?  John has stated that thisi s factory 
callibrated and he only had to adjust things a very few times over the 
years.  Canyon doesn't advertise but tacitly admits slop in the system 
as they sell shims for the focusing screens for those that want it spot 
on as possible.  The stock screen really allows MF at about f4 and the 
Ee-s perhaps 2 stops more precision.
I am guessing and have  seen others assert that the 1-13 allows 
accurate focusing assuming the system is alligned at about f1.4 and the 
2-13 though brighter results in a stop or so loss of precision.  Hate 
that no free lunch principle of optics.

A mostly in focus,
Mike

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