[LRflex] Re: Z + N = ? OT (maybe)
- From: George Lottermoser <imagist3@xxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Mon, 06 Jun 2011 17:09:21 -0500
On Jun 6, 2011, at 4:50 PM, wildlightphoto@xxxxxxxxxxxxx wrote:
> An additional complication is in some phase-detect AF systems that
> calculate the amount to move the lens, send the "move lens" signal to the
> lens, then don't re-check focus once the lens has moved. Normal variations
> in the lens focal length, torque required to start the focus motor, and
> mechanical tolerances can cause front focus or back focus, which several
> manufacturers have compensated for by allowing users to micro-adjust the AF
> system for each lens. They've reduced the buyers' up-front cost of
> calibrating the AF system and in exchange the more particular buyers will
> spend time or other resources doing the calibration work themselves.
Precisely.
And even the high-end, medium format back mfg's cannot get their camera mounts
precisely correct;
for the critical photographers seeking to achieve maximum performance from
their systems.
Regards,
George Lottermoser
george@xxxxxxxxxxx
http://www.imagist.com
http://www.imagist.com/blog
http://www.linkedin.com/in/imagist
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