Astro aimer
Astronomical telescope
Astronomical telescope
Automated telescope
Automated telescope
Automatic focusing lens
Auxiliary lens mounting part
Auxiliary lenses for eyeglasses
Auxiliary objective lens for a firearm sight
Auxilliary eyeglasses
Aviator night vision imaging apparatus or similar article
Base for microscope
Base for microscope
Baseball-type binoculars
Basketball-type binoculars
Battery housing of rifle scope or similar article
Beam splitting adjustable C-mount optical coupler
Beam splitting adjustable optical coupler
Bifocal magnifier
Binocular