Mirror-making is a hobby that has been around for many years, and many people have put their hands to the task, but it is time consuming, requiring a great deal of skill, patience and perseverence. This step is about making one side of the glass concave. Thin Telescope Mirrors . Thin Telescope Mirrors . On the opposite, a shallow mirror (e.g. View Basket (0) £0.00 ex VAT View Quote (0) Register Login. F/D = 8) will be performing very well on planets and the moon. Rough grinding. Part I - Grinding . For many years, amateur astronomers and telescope makers thought it essential that glass for telescope primary mirrors be at least one-sixth as thick as its diameter. Grinding and polishing the mirror is the most difficult part of making a telescope. And the most critical. F/D = 4) well suited for deep sky observations. Part 2 - Polishing . The goals of fine grinding are to prepare the curved mirror face so that it is ready for polishing and figuring and make any adjustments of the focal length. Previously in rough grinding we deepened the center of the mirror's face either by grinding with coarse grit and a tool, slumping in a kiln over a mold, or purchasing the glass pre-generated. It will give your mirror its overall focal ratio. If you make the centre deep, you will end up with a fast telescope (e.g. Abridged from an article appearing in Telescope Making #13 Provided: Courtesy of Astronomy Magazine Article's Author: Bob Kestner . Email: sales@galvoptics.co.uk. mirror grinding kit grind and polish telescope mirror at home mirror blank grinding tool grinding powders ceruim oxide optical polish. Abridged from an article appearing in Telescope Making #12 Provided: Courtesy of Astronomy Magazine Article's Author: Bob Kestner . I am going to start with some additions to topics covered in part 1, on grinding mirrors. Telephone: +44 (0) 1268 728077 | Fax: +44 (0) 1268 590445. Mirror blank kit - posted in ATM, Optics and DIY Forum: Could somebody please point me to a source where I can purchase a kit for grinding a 6" mirror for a Newtonian type telescope…