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Thread: Does the focal length change while AF ?

  1. #1

    Default Does the focal length change while AF ?

    Hi

    Recently got my 55-250IS Canon zoom lens. Noticed that while the lens is autofocusing the focal length also changes, I mean the zoom also changes, and as a result the frame also changes a bit. Is this normal ? Or something wrong with my lens ?

    Thanks !

  2. #2

    Default Re: Does the focal length change while AF ?

    hmm strangely yes...
    its normal..

    i was shooting a very long time before i knew this.. i thought like u something is wrong with the lens..

  3. #3
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    Default Re: Does the focal length change while AF ?

    Ken Rockwell actually comes in useful here
    http://www.kenrockwell.com/nikon/2485afs.htm

    Look @ the section on 'Focus Breathing', it seems to me to be the case
    Last edited by rapier84; 23rd July 2008 at 09:28 PM.

  4. #4

    Default Re: Does the focal length change while AF ?

    thanks very much all !

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