Canon aDSLR fix anounced

Discussion in 'Canon' started by k, Oct 22, 2007.

  1. k

    k Guest

    October 18, 2007 2:02 PM PDT
    Canon has fix for high-end SLR autofocus
    Posted by Stephen Shankland

    An adjustment to one mirror should fix an autofocus problem that has
    tarnished the debut of Canon's high-end EOS-1D Mark III camera, the company
    said Thursday.

    "We're pretty confident this countermeasure will resolve the issue
    completely," said Chuck Westfall, a Canon spokesman and tech guru. "It feels
    nice to have a little bit of light at the end of the tunnel and know it's
    not another oncoming train."

    The US$4,500 camera, geared chiefly for photojournalists who can appreciate
    features such as its 10.5-frame-per-second shooting ability, had won
    accolades for most of its design. But photographer and consultant Rob
    Galbraith dug up problems that cropped up in bright or warm conditions. The
    problems were also confirmed by others including Seattle Times photographer
    Rod Mar.

    Canon was able to reproduce the problems. "What we found out after our
    thorough research is this issue seemed to manifest itself more in cases
    where the temperature was high," Westfall said.

    Not all cameras are affected, but Canon doesn't know which are or aren't, so
    anyone having the problem should send the camera in to be repaired, Westfall
    said. Once it's ready to begin repairs, Canon will publish instructions on
    how what photographers should do, probably in the next two or three weeks.

    New cameras coming off the line don't have the problem, he said.

    The problem involves a mirror that directs light to the camera's autofocus
    subsystem. "That mirror needs to be adjusted," Westfall said.

    Single-lens reflex (SLR) cameras have a main mirror that directs light from
    the lens to the viewfinder, so photographers can see what they're shooting.
    But some light passes through that mirror, traveling instead to sub-mirrors
    that direct light to the autofocus system's sensor. When a photographer
    takes a picture, both the main mirror and the sub-mirror for the autofocus
    system flip out of the way to let light shine on the camera's main image
    sensor.

    The problem with the sub-mirror could mean the camera would focus in front
    of the subject or behind it, Westfall said. "If that sensor is not receiving
    reliable information, it's not able to carry out correct focus prediction,"
    he said.

    (Via Rob Galbraith.)
     
    k, Oct 22, 2007
    #1
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