Binoculars; Eyewear; Microscopes; Spectroscopes; Stereoscopes; Telescopes; Astronomical spectrographs; Lenses for astrophotography; Magnifying glasses; Microscopes, including stereomicroscopes; Optical apparatus and instruments, namely, optical ports for underwater photography, dome ports for underwater photography, wet diopters, adapter lenses for underwater photography; Optical lenses; Prisms for optics purposes; Sighting telescopes for firearms; Telescopic gun sights; Electron microscopes;...