| CPC G02B 23/16 (2013.01) [G03B 17/566 (2013.01)] | 19 Claims |

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1. An apparatus comprising:
a body arranged to engage an optical scope, the body comprising a first portion and a second portion moveable with respect to the first portion between a first position and a second position, the first portion comprising a sidewall defining an aperture having a central axis, the second portion comprising a plurality of magnets;
in the first position, the second portion is arranged to cover the aperture and a radial distance from the central axis to the sidewall is greater than a radial distance from the central axis to the plurality of magnets.
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