Possible that lens element manufacture has gone to China

Discussion in 'Digital SLR' started by Rich, Oct 29, 2005.

  1. Rich

    Rich Guest

    Some other optical devices that switched mfg. from Germany and Japan
    experienced quality control problems. But, since the Chinese military
    optics facilities have taken over, most of the issues have
    disappeared. Their equipment is "state of the art."

    From dpreview.com;

    Canon USA has today posted a service notice relating to the new EF
    24-105 mm F4L IS USM lens. The notice describes a problem which
    affects some early production samples of this lens where 'unacceptable
    levels of flare' can occur, mostly at wide angle and maximum aperture.
    Those lenses with a control number (a serial number beginning with UT)
    of 1000 or less are affected. The notice goes on to offer a free
    repair service (including shipping) which will commence on November
    14th. We haven't seen any other such notices from any other regions.
    Rich, Oct 29, 2005
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  2. Rich

    bmoag Guest

    I seriously doubt that Chinese quality control is anything like what
    Japanese manufacturers formerly achieved in their home contry facilities.
    Canon is not the only manufacturer experiencing quality problems with low
    cost Chinese factories. A case in point: the new Nikon 55-200. If this is an
    example of Chinese quality control in lens manufacturing I think we better
    all stock up now on what KEH and other reputable used dealers have to offer.
    bmoag, Oct 29, 2005
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  3. Rich

    Rich Guest

    Problem is, the companies using them are not asking for that level of
    control, even though it's possible, and cheaper than it would be in
    Japan. Most of the work is done on computer-controlled equipment so
    the human element is reduced and cost-savings only possible with
    speeded up production time and corner cutting. It may be that
    Japanese production has simply passed the point of affordability, at
    least for camera lenses. But, the trick is that using better
    materials in some ways makes up for lesser quality. Case in point, ED
    glass used reduces aberrations even though it's overall quality
    of manufacture may lag that of high precision older lenses. Material
    versus production quality. It's very hard to polish fluorite (Canon
    material) without sleeks owing to it's softness, so you may correct
    colour aberrations while losing contrast due to polish quality. Trade
    off one aberration for another, or rely on the material to correct
    what production can't, due to cost. I've seen examples of this
    Rich, Oct 30, 2005
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