US Optics Sunshade w/ ARD 58mm 2"
An ARD is used for two different purposes, to block stray light rays from entering the objective lens, and to reduce the reflection signature from the glare of the objective lens. U.S. Optics uses a 0.250" aluminum honeycomb that is 1" thick, then installed into a sunshade to accomplish the job. Sizes available for all diameter objectives from 22mm to 80mm.
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