Pentax Lens manual Clamp Screw, Off

Clamp Screw

FA Macro 50mm f/2.8 and 100mm f/2.8 lens- es are equipped with a clamp screw that is used when focusing manually. With manual close-up photography using the copy stand in any situation or with the lens pointing down , if you turn the clamp screw to the ON posi- tion, rotation of the focusing ring becomes tight. This helps to prevent the rotation of the focusing ring due to the lens's own weight and avoid any shift in focus.

•When shooting in the autofocus mode, turn the clamp screw to the OFF position. Activating the autofocus mode while the clamp screw is in the ON position slows down the focusing speed.

OFF O N

CLAMP

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