Canon EOS R3, Advanced User'S Manual

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General eye control precautions
When multiple people will use eye control on the same camera, each person should
select a different calibration number and perform calibration. Similarly, when the same
person will use eye control with and without glasses or contact lenses, a different
calibration number should be selected and calibration performed for each situation.
When using Eyecup ER-h or an optional Eyecup ER-hE, select a different calibration
number and perform calibration.
Hold the eyecup securely against your face to block out sunlight or other light and keep
your eye steady with the four corners of the screen appearing evenly spaced.
Calibration or eye control may not be possible in the following cases.
• When hard contact lenses are worn
• When color contact lenses are worn
• When special eyewear is worn, such as near-infrared blocking, mirrored, or bifocal
glasses or sunglasses
• When a mask is worn
• When your eye is too far from the viewfinder
• When your eye is too close to the viewfinder
• When your eye is too misaligned with the viewfinder
• When the viewfinder or your eyewear is dirty
• When the viewfinder is fogged up
• When your contact lenses are not fully in contact with your eyes
• When sunlight is shining directly into the viewfinder
Less responsive viewfinder display under low light may make eye control more difficult
to use.
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