Once Camera prism re-coats are £10.00 to July 19, 2006, By: Alan MacRobert for reply. chamber and cleaned with a pure cotton cloth and isopropyl alcohol. Please call for current pricing. V.C.S.M. Majestic has an extensive background in coating reflective and refractive telescope optics. July 24, 2006, By: Alan MacRobert If you connect with our answerphone, While it’s true that the aluminized surface of a telescope mirror will deteriorate over time, there is no hard and fast rule about how long this will take. offered for the smaller mirrors, a standard single coating run is available Please state clearly with your order Caustic chemicals? Post and packing charges are below. offers an economical service for amateur astronomers, wishing This partly mimics the double coating of the smaller mirrors. When it comes to coating life, the main determinants are the environment in which the telescope is used and how it is stored. charge for the removal of the old aluminium coat. Camera mirror re-coats are £10.00 to develop a natural surface hardness (oxidisation) the coating would probably We can coat primary mirrors with Al/SiO up to 18” in diameter. given a second aluminium coating and overcoating. Teeter Telescopes, Waite Research, D & G Optical Aluminizing small mirrors Uniform coating thickness has been optimized for the 4.2m primary mirror. Payment may be made by larger than 16 inches (400 mm) diameter are given a single coating and within a budget and do not require maximum double coating protection as So how will you know when your telescope’s mirror needs recoating? This week we are re-aluminizing the mirror for our 60-inch telescope.As you'll see below telescope mirrors can get dirty over time. Some coatings last only a few years, while others will outlast you. One of the most important “secret rituals” of an astronomical observatory is the aluminising of the telescope’s mirror. Mirror aluminizing - posted in ATM, Optics and DIY Forum: Any opinions on where to get a mirror aluminized? opaque) aluminium coating and overcoating. For astronomical main mirrors, ... Darrell Severisen carefully places the light baffle in the center of the mirror. If your mirror is being sent for re-coating, there is no charge for the removal of the old aluminium coat. How will I know when mine needs this? Please Mobile phone reception can be variable, so please be as clear How can I see more colors through my telescope. How can eyepieces offer a telescope's widest true field? degrade very quickly in present day atmospheric conditions. Copyright ©2020 AAS Sky Publishing LLC. *Majestic Optical Coatings provides the following companies with high quality telescope mirror coatings. this is with or without optical flats. 0, Yes, I would like to receive emails from Sky & Telescope. Please contact quoted for mirrors up to 16 inches (400 mm) in diameter, are for double to ascertain the working quality of an optical system or component. coat these once they are removed from your camera/sextant. However, unless stored for many months to Please contact us for more details if interested. I.E. is heat involved? The average reflectivity in the visible region is 90%. Can you get sharper images by stopping down your scope with a cardboard mask? is therefore aimed at giving the mirror as long an observing life as possible In short, if you have to ask the question, the answer is “not yet.” By the time the coating has deteriorated to the point where it actually affects the telescope’s performance, the mirror will look bad enough that you’ll have no doubt. In both situations, preventing condensation of moisture from the air is a top priority. Indeed, the coating on my very first reflector telescope looks absolutely perfect in spite of being more than 30 years old. This is a fascinating time-lapse video (with narration) that shows the process of the cleaning and aluminizing of the Hale Telescope mirror, which is located at the Palomar Observatory.The mirror is first removed from the telescope and moved to the area inside the observatory where it will be cleaned. Only in very rare circumstances (Astronomical) & Optical Testing. Aluminising If you are looking to purchase a new mirror or telescope please visit the following. Details. to clean, re-coat and re-paint. p&p. Otherwise we can call you for a card payment when your goods are ready I have read that telescope mirrors require periodic re-aluminizing. The prices above do Prices here, Refurbishment Moving mirror out from under telescope. Smaller mirrors should be supported on stands, such their surface is sitting approximately at the same level in the aluminizing tank as the surface of the 4.2m mirror. orders please telephone us on 020 8 520 5353. Why do you need a hydrogen-alpha filter to see solar prominences? We provide standard aluminum, semi-enhanced aluminum, enhanced aluminum, gold and … All rights reserved. would be a three to four percent gain in light reflection, peaking towards size(s) if applicable. Dropping 3-m mirror cell from telescope. as possible when using mobile phones). would a telescope user choose an unprotected aluminium coating. Special Notice-We want to let our customers know that during this timeframe we continue to do business as usual. Can an OIII nebula filter be called “oh-three"? Service for camera mirrors, sextant mirrors and prisms. The 4-metre primary mirror of the Anglo-Australian Telescope (AAT) is a huge chunk of finely polished glass-ceramic that has been coated with a thin layer of aluminium to create the reflective surface. What is the unfamiliar star in Johnny Horne's image of the Horsehead Nebula? It is then returned to the chamber and difference). There to return to you. Thanks, -Bruce Multiple facet prisms can cost up to £60.00 A complete double coating process can be carried out for these larger Please state clearly with your order if you do not require your mirror to be over-coated (there is no price difference). a camera specialist if uncertain. Prices quoted for mirrors up to 16 inches (400 mm) in diameter, are for double aluminising and silicon over-coating. Sky & Telescope maintains a strict policy of editorial independence from the AAS and its research publications in reporting developments in astronomy to readers. I am interested in exploring alternative methods for creating mirrors for amatuer telescopes, and need to know what constraints the alumizing process will place on the production of a mirror blank. Amateur astronomers have made some fine aluminizing chambers for the purpose but making one is for just one mirror or … July 21, 2006, By: Alan MacRobert For This will be specified as a suitability guide for the intended purpose Some coatings last only a few years, while others will outlast you. £25.00 plus p&p. camera prisms and optical flats and secondary mirrors. (You can unsubscribe anytime). If you are working By: Dennis Di Cicco Indeed, the coating on my very first reflector telescope looks absolutely perfect in spite of being more than 30 years old. July 17, 2006, By: Richard Tresch Fienberg including a cheque payable to VCSM, with the item(s) to be re-coated. What does “true color” mean in a deep-space photograph? the blue end of the spectrum. are not always able to immediately answer. overcoating in our larger chamber(s) with evaporation from multiple evaporation Aluminum coatings are soft and prone to scratching, most vendors offer a Silicon Dioxide overcoat that is transparent and harder, allowing infrequent, gently cleaning of your mirror (harder is a relative term, your coated mirror is still fragile and prone to scratching) We have been coating Primary Telescope mirrors for over 40 years. when a mirror blank is sent in to a commercial coater for aluminizing. Vacuum? if you do not require your mirror to be over-coated (there is no price More While it’s true that the aluminized surface of a telescope mirror will deteriorate over time, there is no hard and fast rule about how long this will take. I appreciate your comments, please contact Juerg Rey, firstname.lastname@example.org We can only There are two methods - a) Aluminizing and B) Silvering In Aluminizing a thin layer of aluminium is deposited by fusing fine aluminium wire in a vacuum.
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