Canon updates EOS-1D Mark IV and Rebel T2i / 550D firmware

If you were bothered by a shaky aperture when shooting footage with certain Canon lenses … The 1.0.8 firmware updates both the listed cameras.

Fixes a phenomenon in which the set aperture moves unexpectedly when shooting movies in manual exposure mode using some Canon lenses (such as macro lenses).


Supplemental Information: This phenomenon involves the aperture of the lens moving unexpectedly when the focusing ring moves (during focusing). Please note that aperture values also change when operating the zoom ring of a zoom lens that has variable maximum aperture values; however, this is a normal operation because the camera controls aperture values properly depending on the focal length (zoom position).

Click here to download firmware v1.0.8 for the EOS-1D Mark IV DSLR

Click here to download firmware v1.0.8 for the EOS Rebel T2i/550D DSLR

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2 thoughts on “Canon updates EOS-1D Mark IV and Rebel T2i / 550D firmware

Add yours

  1. Because i’m sure Canon is reading here on IBEA…. WE WANT MANUAL AUDIO CONTROL AND UNHOBBLED HDMI OUT! :-)

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