Archived posting to the Leica Users Group, 2007/04/01

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Subject: [Leica] Focus shift
From: pswango at att.net (Phil Swango)
Date: Sun Apr 1 18:54:19 2007

Jeffery Smith wrote:
I wanted to make sure that the aperture was set where I wanted it, so I had
to move the camera from my face. I just made sure it was in focus again
before hitting the shutter button. Under more controlled conditions, I'd
have had it on a tripod.
========================================

Jeffery if you just want to check focus shift (not accuracy) you can still
used the ruler-at-an-angle setup, with the M8 on a tripod.  Focus at some
arbitrary point on the ruler and then go through the apertures without
changing the focus.  If the sharpest point on the ruler doesn't change with
aperture you don't have focus shift.  Your RF may still be off but that's
irrelevant in a focus shift test.  You can do this with SLRs too.  Just
don't change the focus once you set it.

-- 
Phil Swango
307 Aliso Dr SE
Albuquerque, NM 87108
505-262-4085