9 Scientific and educational apparatus, namely, telescopes, planetariums, observatories, domes for observatories, binoculars, and cameras for use in the field of astronomy; components for telescopes, planetariums, observatories, domes for observatories, binoculars, and cameras for use in the field of astronomy, namely, filters and filter systems, safety films, polarizers, contrast boosters, eyepieces and eyepiece clamps, eyecups, finetuning rings, barlows, flatfield converters, spectroscopes, spectrographs, diagonals, focusers, lenses and lens assemblies, coma correctors, spacers, telecompressors, brackets, clamps, dovetail bars and bases, guidescope rings, T-rings and T-ring adapters, red dot finders, and couplers