Offers telescope accessories including mirrors, lenses prisms, and calibration equipment to the professional and amateur market. Site features excellent treatises on optical testing and terms used by opticians to describe optical quality.

Manufactures Ritchey Chretien, APO and Super APO optics, complete RC and refractor OTAs, Dobsonian telescopes, plus professional and custom instrumentation.

Manufacturer of Dobsonian telescopes ranging from 12-1/2" to 30" in aperture. Optional accessories include the ServoCAT servo drive system which may be combined with the Argo Navis digital setting circles.

Produces a variety of binocular designs for both terrestrial and astronomical applications.

Russian manufacturer of high quality optical equipment for law enforcement and civilian use, such as day/night vision sights, powerful binoculars and astronomical telescopes.

Optical company which manufactures telescope optics in a wide range of apertures for amateur and professional class telescopes. Site features the free Ultra-Trace telescope design program.

Chinese manufacturer of binoculars, telescopes, riflescopes, spotting scopes, night vision scopes, golf scopes.

Visual astronomy accessories including adapters, eyepieces, extensions, eyepiece parfocalizers, plus telescopes, hardware, and software.

Manufacturer, retailer and distributor of telescopes and related astronomy accessories.

Manufacturer of customized telescope focusers, Crayford focusers, apochromatic lenses and optical lenses in China.

Extremely robust Crayford style focusers, focuser accessories, truss tubes and truss tube connector systems, plus telescope accent kits to personalize your telescope.

Manufacturer for intermediate optics for connecting digital cameras to microscopes and telescopes. Located in Austria.

A variety of products, components and accessories for the amateur telescope builder. Also offers plans for building a telescope.

Several product lines of telescopes and accessories, eyepieces, CCD imaging equipment, astronomical software, spotting scopes, binoculars, and microscopes.

Designs and manufactures laser and optical components, telescopes and instruments for astronomy, education, and defense. Offers in-house mechanical and optical design, fabrication, and prototyping.

Full product line of German equatorial and telescope mounts with full computer control. Mounts are available for telescopes up to 24" aperture and feature tapered conic sections for increased rigidity.

Products include Easy Guiders, hypered film and hyper kits, diagonals, the Sky Vector NGC, richfield viewers and many other accessories for amateur astronomers.

Produces the Losmandy product line of precision equatorial mounts, dovetail systems, the Gemini goto control system and a variety of telescope accessories.

Taiwanese manufacturer of spotting scopes, field scopes, telescopes, and binoculars.

Manufactures, installs and services opera glasses within theatres. The service is free to theatres, and allows patrons to rent opera glasses during a performance.

Amateur and professional telescopes, microscopes, spotting scopes, night vision devices and 35mm film cameras.

Taiwanese manufacturer of small refractor and reflector telescopes, microscopes.

Newtonian mirrors made and certified in writing to the most exacting, demanding Millies LaCroix tolerance (1/8 wave at the wavefront), twice as precise as the industry 1/4 wave standard.