Via Canon Rumors.
Canon has expelled dual new firmware versions for their EOS 1D Mk IV and 1Ds Mk III models, adding harmony with their new EF 200-400 f/4L IS 1.4x lens. The lens has a built-in 1.4x extender, that creates it a 280â560mm f/5.6 lens. In sequence to rightly work when a new lens...
New Firmware for Canon EOS 1D Models Adds Compatibility with New 200 ...
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