Testing of my MZ-S AF accuracy

[Iren & Henry Chu]

Dear all,

I have used the target plate supplied by the January 2003 issue of CAPA magazine (Japan) to test the AF accuracy of the individual AF sensors of my MZ-S. I used spot AF of each AF sensor of MZ-S to lock focus on the target plate to measure the longitudinal distance between the target plate and area with the sharpest forcus. The result photos recorded by individual sensors can be viewed in the following links:

The left edge sensor: http://www.irenhenry.com/photosharp/focus_left.jpg
The right edge sensor: http://www.irenhenry.com/photosharp/focus_right.jpg
The centre sensor: http://www.irenhenry.com/photosharp/focus_centre.jpg
The top sensor: http://www.irenhenry.com/photosharp/focus_top.jpg

The testing information is: MZ-S, FA*300/4.5, f4.5, aperture priority, tripod-mounted, remote shutter release, mirror pre-fired, Fuji Press 800, target distance about 2m, 3 photos taken for each AF sensors selected under AF-S mode.

My result shows that the AF sensors of my MZ-S in average locked focus at about 5-10mm in front of the target plate. The result agrees quite well with the similar testing carried out in the Dec 02 issue of CAPA Magazine, using MZ-S and FA*85/1.4 lens. Is it due to the problem of my camera, or the problem of Pentax AF technology? Anyone have similar experience?

Regards,

Henry Chu
20/1/2003








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