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  1. #1

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    Can a User Manual Be Wrong?

    The user manual for my Minolta XE-7 explains that, when using an Auto Rokkor lens, the lens should be kept in the stopped-down mode when the shutter is released. I have tested my Auto Rokkor 100/3.5, and the diaphragm clearly stops down automatically at the time of exposure. I tested it at slower speeds, 1/8 and 1/4, so that I would be able to identify the action of the diaphragm. I also used a smaller aperture, f/11, I believe. I would think the authors and/or technicians would have tested this. Perhaps my lens is a later "Auto" version that, with the XE-7, does not require stopping down at the time of exposure?

  2. #2
    Ian Grant's Avatar
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    Yes they can be wrong, they are talking about the pre Auto Rokkor lenses.

    A classic is a 1940 Kodak catalogue explaining how a shutter they sold works, they describe how the width of the shutter slit between two curtains is altered to change shutter speed, in fact the particular shutter has a single s fixed width curtain and only the tension is altered.

    Catalogues, Manuals etc were often written by junior back room staff who didn't have a full knowledge of the products.

    Ian

  3. #3
    benjiboy's Avatar
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    Since the manual was probably translated from the original Japanese by a technical translator who isn't a photographer I wouldn't be at all surprised if it was wrong.
    Ben

  4. #4
    Christopher Walrath's Avatar
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    Human error doth occur from time to time.
    Thank you.
    CWalrath
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    "Wubba, wubba, wubba. Bing, bang, bong. Yuck, yuck, yuck and a fiddle-dee-dee." - The Yeti

  5. #5

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    You just have to experimite!

    Jeff

  6. #6
    Markster's Avatar
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    Quote Originally Posted by Christopher Walrath View Post
    Human error doth occur from time to time.
    To err is human. To really eff things up requires a computer
    -Markster

    Canon AE-1P 35mm | 50mm/f1.8 FDn | 28mm/2.8 FD | 70-200mm/f4-5 FD | 35-70mm/F2.8-3.5 Sigma FD



 

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