Canon CN-E30-105mm T2.8 L SSP - Manual (Page 23)

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Available accessories
A variety of professional camera accessories are available using Φ15 mm and Φ19 mm rod
adaptors.
(When using a Φ19 rod, attach the supplied attachment holder to the lens holder.)
CAUTION
Be sure to use the lens holder when mounting the lens on a
camera. Be sure to avoid applying excessive weight to the lens
mount when the lens is mounted on a lens support.