Archived posting to the Leica Users Group, 2014/02/22

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Subject: [Leica] OT - Sony Alpha 7R
From: photo at (Nathan Wajsman)
Date: Sat, 22 Feb 2014 18:57:04 +0100
References: <>

I'd love to hear Ted's perspective on this thread ;-)

Nathan Wajsman
Alicante, Spain


On Feb 22, 2014, at 5:52 PM, Doug Herr wrote:

> Frank Filippone wrote:
> ( why there really is a
> fine focus adjust feature in higher end cameras.. camera AF is adjusted by
> the user to nail down the precise focus location. 
> <<<
> AF micro-adjust is on DSLR cameras so that the user can compensate for the 
> differences between the image plane at the AF sensor and at the image 
> sensor, and for differences in the phase-detect system's assumption of the 
> lens' focal length and the actual focal length (read: manufacturing 
> tolerances).  A camera using the image sensor as the AF sensor eliminates 
> the image plane discrepancy and a phase-detect + contrast-detect system 
> such as used by the A7 eliminates the phase-detect system's focal length 
> assumption discrepancy.  The A7 (and A6000) should have no need for AF 
> micro-adjustment, likewise the A7r which is contrast-detect only.
> Doug Herr
> Birdman of Sacramento
> _______________________________________________
> Leica Users Group.
> See for more information

Replies: Reply from red735i at (Frank Filippone) ([Leica] OT - Sony Alpha 7R)
Reply from jayanand at (Jayanand Govindaraj) ([Leica] OT - Sony Alpha 7R)
Reply from images at (Tina Manley) ([Leica] OT - Sony Alpha 7R)
In reply to: Message from wildlightphoto at (Doug Herr) ([Leica] OT - Sony Alpha 7R)