Max aperture on Canon 28-135 IS USM

Discussion in 'Canon' started by dohc46, Jan 22, 2009.

  1. dohc46

    dohc46 Guest

    Haven't a clue what I'm doing wrong........

    Canon Digital Rebel XT
    28-135 IS USM (3.5-5.6) "supposedly"
    70-300 IS USM (4-5.6) "yes"

    I can NOT get my 28-135 down to 3.5 F-stop; the lowest number I can go
    is 5.6....doesn't matter if I'm at 28 or 135. I would assume that 28
    would get me the 3.5 stop; doesn't matter if it is on "Auto" or "M"
    I't only stays on 5.6.
    When I do the exact same thing with my other lense 70-300; at 70 I can
    get it down to 4.0 when I move it to 300 it (as expected) goes to 5.6.

    dohc46, Jan 22, 2009
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  2. dohc46

    J. Clarke Guest

    Check for crud on the contacts--if that doesn't help then the 28-135
    probably needs to go in for repairs.
    J. Clarke, Jan 22, 2009
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  3. dohc46

    Paul Furman Guest

    Does zooming out to infinity help?
    Some macro lenses do that at close focus.

    Paul Furman

    all google groups messages filtered due to spam
    Paul Furman, Jan 22, 2009
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