Thin Telescope Mirrors . F/D = 8) will be performing very well on planets and the moon. 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. Thin Telescope Mirrors . This step is about making one side of the glass concave. 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. Email: sales@galvoptics.co.uk. And the most critical. Rough grinding. On the opposite, a shallow mirror (e.g. 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. Part I - Grinding . If you make the centre deep, you will end up with a fast telescope (e.g. Telephone: +44 (0) 1268 728077 | Fax: +44 (0) 1268 590445. It will give your mirror its overall focal ratio. I am going to start with some additions to topics covered in part 1, on grinding mirrors. Abridged from an article appearing in Telescope Making #13 Provided: Courtesy of Astronomy Magazine Article's Author: Bob Kestner . F/D = 4) well suited for deep sky observations. 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. Abridged from an article appearing in Telescope Making #12 Provided: Courtesy of Astronomy Magazine Article's Author: Bob Kestner . 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… Part 2 - Polishing . mirror grinding kit grind and polish telescope mirror at home mirror blank grinding tool grinding powders ceruim oxide optical polish. View Basket (0) £0.00 ex VAT View Quote (0) Register Login. Grinding and polishing the mirror is the most difficult part of making a telescope.