Telescopes; Apparatus for recording distance; Astronomical spectrographs; Distance measuring apparatus; Electronic detectors for observing and measuring the infrared spectrum, namely, infrared detectors; Instruments for measuring length; Magnifying glasses; Microscope objectives; Night vision goggles; Optical apparatus and instruments, namely, optical ports for underwater photography, dome ports for underwater photography, wet diopters, adapter lenses for underwater photography; Optical chara...