How to identify apochromatic or achromatic lenses in telescopes - Quora
Removing Water Spots from Refractor Telescope and Cinematography Objectives - YouTube
How to clean your telescope's mirrors the easy way
Teeter's Telescopes on Twitter: "Cleaning the objective lens of a classic Unitron scope. Customer brought in after the lens got loose from its cell. http://t.co/8OIXEp38Oj" / Twitter
How To Clean A Microscope | Eyepiece | Objective | ABBE Condenser | Base Lens | Camera - YouTube