Canon efs 60mm f2.8 macro underexposure wide-open

Discussion in 'Digital Photography' started by Geoffrey, Oct 11, 2006.

  1. Geoffrey

    Geoffrey Guest

    Hi

    I just got the above lens, and, while testing it in tungsten light with
    my 350D on Av auto between f/2.8 and f/16, with the target at a
    distance of about 2.5m, I noticed that at f/2.8, and only at this
    aperture, I needed to add 2/3 stop of exposure to get the same result
    as at other apertures. In fact the exposure with the lens set to f/2.8
    was the same as for f/3.5. I know the max aperture varies with
    distance, but I thought the camera would compensate for this.

    Anyone know where I'm going wrong?

    Cheers
    Geoff
     
    Geoffrey, Oct 11, 2006
    #1
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