It's a little difficult to see, but one side of the lens has an indent.
This is the side that faces the eye-cup and sits on top of the LEDs in the ring.
(the mark is just to help show you where the recess is at)

Next, secure the lens with your hardware of choice. If the tolerance between the screw and the plastic is too tight, consider tapping the hole first.

This guide was first published on Oct 22, 2013. It was last updated on Oct 22, 2013.

This page (Lenses) was last updated on Oct 22, 2013.

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