Canon EF 70-300mm f/4.5-5.6 DO IS USM

Discussion in 'Canon' started by Richard J Kinch, Dec 13, 2007.

  1. Regarding the Canon EF 70-300mm f/4.5-5.6 DO IS USM lens, am I correct that
    the front does not rotate or extend-retract with focus and zoom? This
    information is not apparent to me from Canon's specifications and chart. A
    non-rotating and non-extending design is critical for certain
    instrumentation applications.
     
    Richard J Kinch, Dec 13, 2007
    #1
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  2. Richard J Kinch

    Ali Guest

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  3. Richard J Kinch

    Frank ess Guest

    That lens is one of the very few that have a lock to prevent "lens
    creep"; if you hold it with the front element toward the center of the
    Earth, and the lock is not engaged, the lens lengthens considerably.
    Seems to me this indicates it is not non-extending.

    Nice piece of kit, otherwise.
     
    Frank ess, Dec 14, 2007
    #3
  4. Richard J Kinch

    Doug Freese Guest

    I just bought this lens, good thing I read the instructions about the
    lock. :)
    I have only had it for day and only a few minutes to play. Has anyone
    found the IS "motor" to be noisy as in a whirring sound. I have the
    17-85mm IS and I don't hear anything so any sound caught me off guard. I
    called the store and the salesperson claimed that was normal. Not that
    I distrust that person but I will take it to the store for an up close
    listen.

    In the mean time can anyone with the same lens shed some light on the IS
    noise? If it makes a difference it's mounted on an XTi.

    -Doug
     
    Doug Freese, Dec 14, 2007
    #4
  5. Richard J Kinch

    Steve Dell Guest

    I shot with this lens for about a year or so. I found it an excellent travel
    and hiking lens for wildlife.

    What I noticed many times is that it is sharp between 70 and 200 but gets
    progressively softer going out toward 300mm.

    I've since sold this and bought the 100-400 IS.

    Steve
    Tucson AZ
     
    Steve Dell, Dec 14, 2007
    #5
  6. Richard J Kinch

    Doug Freese Guest

    Handheld, tripod, or both?
    And how did the 100-400n behave 200+? Was the 100-400 worth twice the
    cost?

    And my original question was the IS motor noisy?

    -Doug
     
    Doug Freese, Dec 14, 2007
    #6
  7. Richard J Kinch

    Steve Dell Guest

    So far, my observations with the 100-400 is that it's quite sharp out past
    300.

    As for cost, I paid $1000 for the DO and about $1250 for the 100-400. (Both
    used on eBay.)
     
    Steve Dell, Dec 14, 2007
    #7
  8. Richard J Kinch

    jean Guest

    You can definitely hear the IS motor, as for the lens, I had one and did not
    find it to be very sharp, and not just at the long end, so I traded it in
    for a 300mm f4 IS L which is great. If I remember right, the focus motor
    was very quiet.

    Jean
     
    jean, Dec 15, 2007
    #8
  9. Richard J Kinch

    Doug Freese Guest

    Thank you!!!

    -Doug (the nicer one)
     
    Doug Freese, Dec 15, 2007
    #9
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