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We should see the new EOS-1D X firmware on Wednesday, January 30, 2013.
Firmware notes below
This firmware update is to improve operational function in response from several professional photographers that the Image Selection button was pressed without realizing and the image size had been changed. Also, this firmware incorporates quality issue fixes that have been reported from the market.
1. Details of Functional Improvements and Fixes
1-1. The function to disable the Image Size selection button is added.
1-2. Fixes Err 70 and Err 80 which may occur depending on the camera settings, shooting scenes, or the timing of releases. Also, some complained camera freeze when Err 80 occurred.
The above mentioned (1-2) phenomenon occur in very rare instances. In addition with the firmware update for 1-1, the fixes for these phenomena have been incorporated.
a) Err 70
In customization of operational buttons, there were errors in operational program for the exposure level display in the viewfinder when the Main Dial is set to change the aperture value in Manual mode, and may cause Err 70.
b) Err 80
Err 80 may occur depending on the distance to the subject, shooting scenes, or the timing of metering.
This phenomenon occurs in very rare instances due to the error in operational program for metering when shooting a subject at a distance with telephoto lenses with focal lengths of 300 mm or 400 mm.