Sony a7CR Help Manual page 88

Be sure to hold the lens straight when attaching it.
To remove the lens
Keep pressing the lens release button (A) and turn the lens in the direction of the arrow until it stops.
After removing the lens, attach the body cap to the camera and the lens caps to the front and rear of the lens to prevent
dust and debris from entering the camera and lens.
Note
When attaching/removing the lens, work quickly in a dust-free location.
Do not press the lens release button when attaching a lens.
Do not use force when attaching a lens.
A Mount Adaptor (sold separately) is required to use an A-mount lens (sold separately). When using the Mount Adaptor, refer to
the operating manual supplied with the Mount Adaptor.
If you want to shoot full-frame images, use a full-frame size compatible lens.
When you use a lens with a tripod socket, attach a tripod to the tripod socket of the lens to help balance the weight of the lens.
When carrying the camera with a lens attached, hold both the camera and the lens firmly.
Do not hold the part of the lens that is extended for zoom or focus adjustment.
Related Topic
Mount Adaptor
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