in Rotating and Standard Hinged Rings, Large Aperture Newtonian Telescopes, Classical " Dall-Kirkham Cassegrain Telescopes, German Equatorial Mounts, Aluminum Tubing, and Portable... Piers. Newtonian Reflecting Telescopes We offer Newtonian reflecting telescopes in apertures of 10", 12.5", 14.5", and 16". Since all of our tube assemblies are built on a custom...Parallax Instruments, Inc - About Us Parallax Instruments, Inc. Precision astronomical telescopes and mountings Homepage About Products Testimonials Contact About Us Specializing...