Bruce Berger explains some of the highlights of amateur telescope making, tells some of his Stellafane winning secrets, and has links to some useful scope ...

Optical aberrations in amateur telescopes. Includes principles of physical and optical imaging with detailed review of primary aberrations. Also, aberrations in ...

A UK based company supplying the world with optical components and instruments including flats, spheres, aspherics, paraboloids, toroids and windows. They ...