Sony Handycam NEX-VG900 Operating Manual page 21

To attach the lens
Align the mounting index (orange) on the lens barrel with the mounting mark  on the
mount adaptor. Insert the lens into the mount adaptor's mount and turn it clockwise until it
locks in place.
Do not press the lens release on the mount adaptor while mounting the lens as it will not couple

properly.
Do not insert the lens at an angle.

Removing the lens
To remove the lens
Hold down the lens release  on the mount adaptor and turn the lens counterclockwise until
it stops. Carefully lift the lens out of the mount adaptor's mount.
Mounting index
(orange)
US
1