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OPT carries select products from Astro-Tech, including a variety of very affordable Ritchey-Chretien telescopes and "Imaging" Newtonian optical tube assemblies. Astro-Tech RC telescopes start at 6" in aperture and graduate up to 12". The 6" model has a focal ratio of f/9, and the 8", 10", and 12" versions are all f/8. The Newtonian OTA's are a fast f/4 and have larger than normal Crayford focusers.