Microscopes and accessories therefor, including objective lenses, ocular lenses, mechanical stages, illuminating apparatus, photomicrographic apparatus, monocular attachments, binocular attachements, triocular attachments, photomicrographic exposure meters, phase contrast equipment, electric and electronic flash equipment, microcinematographic equipment, filters, microscope stands, binocular tube with phototube, nose-pieces, condenser mount, lamp houses, transformers, lamp sockets, collectors, frosted glasses, lamps and dust covers,cases for microscopes