Made by Thousand Oaks Optical, these full-aperture glass solar filters fit tightly over the end the front aperture of the telescope and are made in a variety of sizes to work with most popular aperture telescopes from small refractors to reflectors up to 16-inches. åÊThese white-light solar filters are the gold standard of eclipse chasers around the world.
Genuine Thousand Oaks Optical Type 2+ Glass solar filters start with hand selection of high quality glass substrate and are then coated with Thousand Oaks' proprietary Type 2+ coating that produces a natural warm yellow solar image.
The hard coating is the most durable in the solar filter industry. Guaranteed to last for at least fifteen years, if properly cared foråÊthese filters could easily last a lifetime.
Quality is paramount with the owner of Thousand Oaks Optical, even to this day the founder of the company, Mr. Pat Steele, tests each and every filter himself. Independently tested for safety, these solar filters transmit only 1/1000th of 1.0% of the light passing through.åÊ
To select the right size filter, measure the O.D. of the front aperture of the tube assembly where the aluminum solar filter cell will fit over, and then select the front cell ID from the list above. Each filter is supplied with a generous amount of thick felt that provide a very snug fit. åÊ