A telescope’s main purpose is to collect ... Some high-end models are sold as “optical-tube assembly only” versions. This means what it says: All you’re purchasing is the optics in the ...

The PowerSeeker 80AZS offers a thread for easy attachment to the optical tube. Swinging the telescope up and down and left to right, the alt-azimuth mount is a breeze to move, with no catching or ...

ISTAR’s Phoenix WFT 204-6 Comet Hunter optical tube assembly features an f/5.9 achromatic doublet objective. The telescope offers fully multicoated optics and includes a dual-speed, fully ...

The Optical Tube Assembly (OTA) measures a 1000mm (f/5) focal length and 200mm primary mirror diameter. Its design is recognized as a 'fast' telescope because of its light-gathering capabilities ...

Small aperture, good optical quality refractors are available ... These are essentially just large telescope tubes mounted in a box-like cradle that can be swiveled around to point the telescope ...

This telescope incorporates a manual focus adjustment with a micrometer scale, which is built into the design of the optical tube. This allows for simplified focusing by noting the "sweet spot ...

As a result, we focused on telescopes that were relatively lightweight, compact, and durable. Optical quality was key, as even travel telescopes should provide a good viewing experience.