With experience this test method is easily capable of revealing wavefront errors of  1/8 wave and smaller. Professional Grade �330 Secondary Size 82mm �144, Standard Grade �566 I have been making astronomical optics for in excess of  30 years and have supplied optics to customers in Germany, France, Belgium, Denmark, Sweden, Netherlands, Ireland, Japan, Slovenia, South Africa, S Korea and Greece as well as the UK. Ultra Grade �724, Secondary Size 50mm �60 This telescope type uses a concave primary mirror and a flat diagonal secondary mirror. Secondary Size 63mm �90 Recommended These folks carry a large selection of telescope mirrors and parts, as well as telescope kits and lots of accessories. Each is Supplied with full Zygo interferometer report.These primary mirrors are expensive, they are also not recommended for just occasional star gazing. Research Grade �381 Research Grade �2203 We have set ourselves the challenge of continuing the fine tradition begun by makers such as… Secondary Size 63mm �90 The optics we produce are world renowned for being among the best available. Their incredible accuracies and reflective characteristics lend themselves to the realms of optics we have supplied to: OPTICS : Telescope Mirrors : Elliptical Flats : Mirror Cells : Zygo : Optics Finish Note : PV ExplainedMirror Recoating : All About Optics : Optical Coatings : Optical + Telescope Testing, Research Grade �220 For a given mirror a computer simulation may be generated showing the degree of curvature in the observed ronchi bands for varying degrees of spherical aberration. Secondary Size 82mm �144, Standard Grade �1628 Professional Grade �654 Secondary Size 100mm �234 Recommended Contact our Sales Team by Email: sales@orionoptics.co.uk or Telephone: 01782 614200, TERMS & CONDITIONS | FIND US | YAHOO GROUP. We offer a Telescope mirror re coating service for both Primary and Secondary telescope mirrors. My mirrors are made to the following design and use specifications. To ensure my optics are of the highest quality a variety of tests are used. Each optical surface is tested up to 29 times as it passes through its many processes of being turned from a blank piece of glass to a highly accurate figured mirror or lens. Below is our selection of Telescope Mirrors available to purchase and a brief description of each grade's qualities. Prices are for complete Mirror Sets (main mirror & flat). Secondary Size 82mm �144 It will calculate parameters for two different telescope designs and compare the results for you. Mirror blanks are individually tested for internal strain. More than 30 years of telescope building experience and over 250 truss-tube telescopes built in my workshops in Nottingham. 1/4 PV wavefront specification giving excellent images for any choice of subject. Ultra Grade �268, Secondary Size 35mm �42 Recommended Ultra Grade �1560, Secondary Size 63mm �90 Mirrors: I am happy to build telescopes around a customers own mirrors. Welcome. Professional Grade �318 Secondary Size 63mm �90 Recommended Supplied with full Zygo interferometer report.ResearchWe measure regularly in their manufacturing process and, Zygo interferometer tests confirm, our Research Grade optics are some of the finest optics available anywhere at any price. Secondary Size 75mm �114 Recommended Research Grade �400 For more information about optical standards please read the notes on my articles page. Research Grade �507 Straight bands indicate that the mirror is of high quality, in this case at least 1/8 lambda P-V surface error. Our Ultra range has Strehl values typically around 99% with RMS values of the order of 0.02PV. Produced from quality low expansion Suprax glass from Schott Germany. Research Grade �738 Research Grade �220 In order to assess a mirrors surface the observed curvature of the ronchi bands is compared with a computer generated image. Professional Grade �2607 Secondary Size 50mm �60 Recommended, Standard Grade �128 Professional Grade �1160 Telescope MIrror Sets to purchase online. Research Grade �537 The biggest drawback to the Newtonian design is the placement of the eyepiece. This page has formulas for many telescope and mirror parameters. It's also arguably the most accurate surface made by man or machine. We manufacture telescopes and accessories such as telescope wheels, carrying cases, guiding computers, focusers, motors and motor controls and much more. Ultra Grade �270, Secondary Size 44mm �50 We also offer a recoating service for Sextant mirrors. Jim's Mobile, Inc. (JMI Telescopes) is a world renowned manufacturer of astronomical telescopes and aftermarket accessories for the amateur and professional astronomer. Coated with Hilux enhanced optical coatings. All of our telescopes are individually made to suit our customers' wishes and are designed to look wonderful, as well giving excellent optical performance. Secondary Size 50mm �60 Recommended Professional Grade �1747 With a null test a perfect mirror produces straight bands when viewed with a ronchi ruling, any curvature of the bands indicates the amount of spherical aberration present. Companies of the pedegree of Broadhurst & Clarkson have been taken over by Fullerscopes, a company run by a likeable rogue by the name of Dudley Kilburn Maurice Fuller. If the mirror is expanded to the size of a football field, then the mirror's surface will be smooth to 1/1000 inch or 1/30 millimeter! Secondary Size 82mm �144 Recommended Professional Grade �188 These are well established tests and are used widely by professional optical shops the world over. Kenneth Novak & Co. - Box 69T, Ladysmith, WI 54848, 715-532-5102 Generally regarded as one of, if not the, best makers of mirror …