Telescope primary mirror

Our Price:$610.00. Out of Stock. Out of Stock. Free US Shipping. Coming Soon. GSO Parabolic Primary Mirror (Quartz) - 8 f/6 # AD080 GSO's parabolic primary mirrors are perfect for those who want to build their own telescopes or replace mirrors in older ones. Ranging in aperture from 6 to 16 and offered in various f-ratios, these mirrors are made from optical grade BK-7 glass. All mirrors have a reflective aluminum coating with a reflectivity of 92-93%

Primary Mirrors - Mirrors & Holders - Parts & Accessories

The Primary Mirror Cell Our Finished Primary Mirror Cell The purpose of the primary mirror cell is to hold the primary mirror gently but firmly in the center of your tube, and provide tip-tilt adjustment so your telescope can be collimated. It should also provide adequate air circulation so that your mirror will cool down quickly For primary mirror testing, our optical shop incorporates the use of two interferometers, an equal-path and a scatter-plate. The use of these sensitive tools require isolation-flotations tables and high quality optical supports to eliminate vibrations. This is very expensive equipment Obsession Telescopes feature primary mirrors made by two of the best established and most reputable optical companies serving the astronomy community today. Optical Mechanics Inc. (OMI) supplies Obsession with 12.5 to 25 aperture mirrors. Ostahowski Optics supplies Obsession with 15 to 22 aperture mirrors Jim's Mobile, Inc. (JMI Telescopes) is a world renowned manufacturer of astronomical telescopes and aftermarket accessories for the amateur and professional astronomer. We manufacture telescopes and accessories such as telescope wheels, carrying cases, guiding computers, focusers, motors and motor controls and much more The large increase molecular energy is used to force a chemical reaction to near 100% completion at a lower temperature. The aluminum overcoating process for telescope mirrors requires the use of metal oxide compounds as starting materials. The two most common overcoat compounds for the aluminum layer are silicon monoxide and titanium monoxide

James Webb Space Telescope Mirrors Will Piece Together

GSO Parabolic Primary Mirror - 10 f/

  1. The Star Test is the most critical optical test in the world for telescope mirrors. The Star Test can take a good mirror and show it for what it really is. Sure, Mr. Kennedy has a whole lab full of interferometers, masks, and testing equipment, but when it comes to putting that final, perfect figure on the mirror, that mirror is outside.
  2. Reflector optics utilise mirrors to produce visuals for telescopes. These mirrors are as I mentioned earlier, regarded as primary and secondary mirrors. The primary is concave mirror whilst the secondary mirror is flat with its main purpose being to reflect the gathered light into an eyepiece and ultimately to your eyes
  3. g, requiring a great deal of skill, patience and perseverence
  4. um reflective coating, reflectivity is approximately 93%
  5. For example, the Advanced Technology Solar Telescope (ATST) 4.24-meter primary mirror uses a jet cooling system. Based on the extensive research, ASTS concluded that thinner substrates dramatically reduce the thermal time lag, Technical Note #0028 by Nathan Dalrymple
  6. Telescope Mirror Set - 203mm Primary & 100mm X 70mm Secondary Mirrors. 5.0 out of 5 stars 1. $129.99 $ 129. 99. FREE Shipping. Only 5 left in stock - order soon. 160mm Telescope Spherical Mirror - 1300mm Focal Length. 4.7 out of 5 stars 8. $69.99 $ 69. 99. FREE Shipping

Telescope Mirrors for sale eBa

Parabolic Mirror Lens for Newtonian Reflection Telescope Primary Mirror 203mm. $375.06 to $403.26. Was: $399.00. $37.99 shipping. SPONSORED. DIY Newtonian reflection astronomical telescope Primary Mirror Parabolic Lens. $241.57 to $532.03. Was: $256.99. $5.99 shipping. 2 watching Shortly after the Hubble Space Telescope's launch in 1990, operators discovered that the observatory's primary mirror had an aberration that affected the clarity of the telescope's early images. Hubble's primary mirror was built by what was then called Perkin-Elmer Corporation, in Danbury, Connecticut The primary mirror in most modern telescopes is composed of a solid glass cylinder whose front surface has been ground to a spherical or parabolic shape. A thin layer of aluminum is vacuum deposited onto the mirror, forming a highly reflective first surface mirror. Some telescopes use primary mirrors which are made differently

Parabolic mirror: GSO offers very HIGH quality parabolic mirrors for the people who want to build their own telescopes or DIY project. The parabolic mirror size from 6 to 24, all of these mirrors were made by BK7 or Quartz quality optical glass, all mirrors have an enhance aluminum reflective coating, reflectivity is approximately 93%. The aluminum coating is protected by a properly applied. Waite Research is building Renegade telescopes with premium primary mirrors 10 and up. Our i nnovative telescope design and optics offer exquisite night views of Saturn, Jupiter, and the moon, as well as open clusters, nebulae and galaxies. Renegade telescopes include premium, Waite Research mirrors, top-end Starlight Instruments Feather Touch. After light travels down the length of the telescope, it hits the concave, or bowl-shaped, primary mirror. The light reflects off of the primary mirror and travels back toward the front of the telescope. There it hits the secondary mirror, which is convex, or dome-shaped

Casting a light weight telescope mirror (all steps in the process) In this video I show how I designed, cast, slumped and coldworked a light-weight telescope mirror blank prototype. The blank is 10 inches in diameter, but only weighs 4 lbs 13 oz. It has a ribbed back design for rigidity, and is pre-slumped to f/4.9 English: Comparison of nominal sizes of primary mirrors of notable optical reflecting telescopes, and a few other objects.Dotted lines show mirrors with equivalent light-gathering ability. The telescopes shown in this comparison are listed below, ordered in each sub-section by (effective) mirror/lens area , low to high, and then by actual/planned first light date, old to new

New D150F750 Primary mirror + secondary mirror Mirror Set for Telescope US Stock. Brand New. $68.39. Was: Previous Price. $71.99 5% off. Buy It Now. Free shipping. Free returns To get your telescope well collimated, here is what you need to accomplish: Step 1: Center the secondary mirror on the axis of the focuser drawtube. Step 2: Aim the eyepiece at the center of the primary mirror. Step 3: Center your primary mirror's sweet spot in the eyepiece's field of view Astronomy telescopes, Dobsonian telescope kits, primary mirrors, elliptical secondary mirrors, (Also WHEN AVAILABLE: mirror holders, spiders, lenses, telescope parts, astronomy accessories, eyepieces, filters, diagonals, finder scopes, Telrads, photo adaptors, close-out specials) Exclusively using Coulter Optical ® optics. Serving Amateur. Read Customer Reviews & Find Best Sellers. Oder Today Step #1: Remove the primary mirror. Your telescope's main mirror is housed in a cell that normally attaches to the tube with a few small screws. Before removing these, stick a small strip of masking tape to the mirror cell and tube to index it so that you can put it back together the same way

About our mirror suppliers. Obsession Telescopes feature primary mirrors made by two of the best established and most reputable optical companies serving the astronomy community today. Optical Mechanics Inc. (OMI) supplies Obsession with 12.5 to 25 aperture mirrors. Ostahowski Optics supplies Obsession with 15 to 22 aperture mirrors Our Finished Primary Mirror Cell. The purpose of the primary mirror cell is to hold the primary mirror gently but firmly in the center of your tube, and provide tip-tilt adjustment so your telescope can be collimated.It should also provide adequate air circulation so that your mirror will cool down quickly

Zambuto Optical Company - Newtonian Telescope Mirror

AstroGoods mirror cells are individually designed and built with computed support point positions for optimal performance. By computing support points from your mirror's specifications, glass deformation is minimized. Designing to your mirror's thickness and diameter prevents unwanted movement in the cell. Design: 6 cell is a set design, with. We have primary mirror heaters for 8 to 18 mirrors. They are very effective in the prevention of dew on Newtonian telescope optics, particularly for those who have Dobsonian telescopes with open truss tube designs

Coatings. The leader in precision optical mirror coatings for telescopes and astronomy. Producing Front Surface Mirror coatings, Anti-Reflection, Beam splitter, hot & cold mirrors, dichroic filters that meet and exceed the standards of the optical thin film industry. Specially Formed 24 Telescope Mirror. 3D Designand Modeling plus CNC Machining Primary mirror scratches - posted in Beginners Forum (No astrophotography): I cleaned my primary mirror for the first time last night. I am not sure if my mirror may have had very light scratching on it before I washed it, but it does now. The scratches are lateral and all in the same direction. I did not make any motions this way. I used my finger tips per a tutorial posted by Starman For mirrors 16 diameter and under, please include $35.00 for this test. Mirrors 18 diameter and over include $60.00 for the test. This nominal fee will be applied to the refiguring cost should you wish to have that done. The longest focal length our shop can accommodate is 112-inches. Send in your uncoated mirror and a complete test will be.

Space Telescopes | Historic Spacecraft

TECHSPEC® Precision Parabolic Mirrors are available in sizes ranging from 3 (76.2mm) to 16.25 (412.8mm) and are ideal for a wide range of applications. These parabolic mirrors are offered with protected aluminum, enhanced aluminum or protected gold coatings. Uncoated substrates are also available. Optical Cell Kinematic Mounts The NEW 22 f/4.2 UC is a revolutionary design. It is a large aperture telescope that collapses into a very small package. If you have limited hauling or storage capacity, then this is the scope for you. Our revolutionary Virtual Mirror Box (VMB) is the foundation of the UC design. It is a welded steel framework made from NC laser cut steel GSO offers secondary flat telescope mirrors to match the complete telescope set request. Our elliptic flat mirror has the same high optical quality as our parabolic primary mirrors using BK7 quality glass. All of the mirror surface quality over 1/12 wave RMS at the least, typically better. All mirrors have an aluminum reflective coating of 93%

Lightholder Optics--Premium Newtonian Mirrors. Newtonian Mirrors made and certified in writing to be well within the most exacting, demanding Millies LaCroix tolerance - typically better than 1/10 wave on the wavefront - which is over twice as precise as the industry 1/4 wave standard Primary mirror edge support The most neglected and least understood part of a mirror cell is the edge support, the part that keeps the mirror from sliding out of the cell when the telescope is pointed anywhere other than straight up

NASA's James Webb Space Telescope is not finished

The design is based on one described in Neale E. Howard's Standard Handbook for Telescope Making and is one of a family of double plate mirror cells. The main components are two disks of plywood separated by a center pivot. Adjusting the three collimation knobs changes the tilt of the primary mirror The primary is concave mirror whilst the secondary mirror is flat with its main purpose being to reflect the gathered light into an eyepiece and ultimately to your eyes. As for how a reflector telescope works, light is often gathered in through the open end of the tube near the top of the device hitting the concave mirror at the base before. -Weight is the approximate weight of the primary mirror only, and Thickness is the thickness of the primary mirror at the edge. Thinner mirrors cool much faster and perform better. They also weigh less, of course. Weights with and asterisk * are estimated, others were obtained by weighing a blank Cleaning telescope optics should only be done when necessary. It is not necessary to clean the lens or mirror of your scope if it just has a few visible specks of dust. Overly frequent or aggressive cleaning can actually damage and prematurely age the special coatings on mirrors and lenses-permanently degrading their performance DobSTUFF - Telescope and ATM Components. Components and a aluminum tubing now available: Email me with your requirements at densteele@dobstuff.com or call 650-315-6578 anytime. Thanks, Dennis. For paypal users, use this button to place your order: You DO NOT need a paypal account to use a credit card

Internal, velvet-lined, Mirrorbox baffling and structural component consisting of 1/2 Baltic Birch plywood dado'ed into place. This acts both to make your mirrorbox super rigid and act as a knife edge baffle to knock down stray light from entering the optical pathway from behind the primary mirror Primary Mirror. The primary mirror is defined as the light gathering, or refracting surface of a telescope. It is also called as the telescope's objective. In a reflecting telescope, it either uses a single or a pair of curved mirrors to reflect light in order to form an image based on the location where the said telescope is focused on The price for secondary mirrors listed above is ONLY for secondary mirrors sent along with a primary mirror. For a Fee of only $10, Spectrum Coatings will install a Highly Reflective Center Mark (a Reflective Triangle with a hole in the center - Aids in mirror alignment/collimation process). * Please include Return Shipping money with your mirror He added to his reflector what is the hallmark of the design of a Newtonian telescope, a secondary diagonal mirror near the primary mirror's focus to reflect the image at 90° angle to an eyepiece mounted on the side of the telescope. This unique addition allowed the image to be viewed with minimal obstruction of the objective mirror

To do so, we need to work with the collimation knobs on the primary mirror at the back of the telescope. Most telescopes have easy to use knobs and some standard screws. There is a set of 6 knobs. 3 knobs are adjusting the tilt of the primary mirror, and 3 of them are just locking knobs that lock the mirror in the position you set 100mm Secondary Mirror Spider Cell [Indian ] 255: Compatible Tube for 100 Primary Mirror Cell = 110 Dia PVC Rigid Tube / Pressure 2.5kg available in the local market. 114mm Secondary Mirror Spider Cell [Indian ] 300: 125mm Secondary Mirroir Spider Cell [Indian ] 30 LUVOIR Architecture A (LUVOIR-A) features a 15-m diameter primary telescope aperture and four serviceable instruments, while Architecture B (LUVOIR-B) has an 8-m telescope aperture and 3 instruments. The primary mirror for LUVOIR-A is an on-axis three-mirror anastigmat system (TMA)

Centre-Dotting Your Scope's Primary Mirror - Gary Seroni

  1. Leave the mirror on an even surface and rinse it with water to get rid of the soapy solution. Lift the mirror slightly and blow the solvent from the surface in a back and forth motion. Finally, dry the edges of the mirror with cotton to remove any streaks. Tips to Keep Your Telescope Clean. Avoid touching the mirror and lenses
  2. Cassini Spherical Primary Mirror PM-160 Focal Length: 1300 mm, Size: 160 mm, 29% Off w/ Free S&
  3. The Nancy Grace Roman Space Telescope's primary mirror, which will collect and focus light from cosmic objects near and far, has been completed. Using this mirror, Roman will capture stunning space vistas with a field of view 100 times greater than Hubble images. Achieving this milestone is very exciting, said Scott Smith, Roman.
  4. The James Webb Space Telescope primary mirror is 6.5 meters (21 feet 4-inches) across. The Hubble Space Telescope primary mirror is 2.4 meters (8-feet) across. The Webb Telescope's longest segment is its sunshield at 21.18 meters (69.5 feet) long. The Hubble Space Telescope is 13.2 meters (43.5 feet) long
  5. Astronauts famously fixed its flawed primary mirror during a servicing mission in 1993, and the telescope has been providing jaw-dropping views of the cosmos, and amazing scientific discoveries.
  6. 2.1 Telescope design The two-mirror system is used to reduce the overall size of the telescope and to balance some of the spherical aberration. The Seidel spherical aberration from the primary mirror alone, W 4, is calculated as 4 512 3 p p F D W = (Eq. 1) Where F p = focal ratio of the primary mirror (focal length/aperture diameter
  7. In a refractor or a reflecting telescope, the focal length start at the aperture (primary mirror or objective lens) and ends at the focuser where the light rays come together. Generally, when looking at a telescope, it's safe to assume that a long tube means a long focal length and a short tube means a shorter focal length

Parabolic telescope mirrors - R

The secondary mirror reflects the light from the f/1 primary mirror and converts it to an f/15 beam for the science instruments. The mirror is 3.1 meters (10 feet) in diameter, as large as the primary mirrors of many telescopes currently in use. It will be mounted in a steel mirror cell that contains the axial and lateral supports for the mirror The agency said last week that errors in a test instrument apparently led Perkin-Elmer, which fabricated the optics, to finish the 2.4-metre primary mirror of the Hubble Space Telescope incorrectly Every primary telescope mirror has a fixed focal length that's usually 4 to 6 times the width of the mirror. When you add the minimum distance from the eyepiece to the secondary mirror together with the distance from the secondary mirror to the primary, the total length should be the primary mirror's focal length

Stellafane Primary Mirror Cel

  1. Mount the primary mirror in its mirror cell and then in the tube. The location of the primary mirror cell support is approximate and will work with most mirrors. If your primary is exactly 48″ in focal length, then the distance from the center of the focuser hole to the center of the mirror cell support should be 45″, as on the diagram
  2. Shortly after launch, NASA discovered that a flaw in Hubble's primary mirror was marring its images. So in 1993, astronauts launched into space to repair the telescope
  3. This is the basic description of how to collimate a reflector telescope. Go to the long version for more detail. Step 1 - Adjust (up-down, side-side, rotation) the diagonal (secondary) mirror so it is centered in the eyepiece. Step 2 - Adjust the angle of the diagonal mirror so the primary mirror center mark centers on the eyepiece crosshairs
  4. The primary mirror's cells are attached to the end of the telescope by screws; these need to unscrewing first. Pull out the cell, and the mirror will be inside. The mirror will be kept in place by some clips

Discovery Telescope

  1. um on October 20, 2017. This was the eighth coating work from its arrival at Maunakea, Hawaii in 1998, and was about four years from the previous recoating on August 15, 2013
  2. TELESCOPE MIRRORS, BLANKS, TOOLS, TESTERS, GRINDING MATERIALS, POLISHING MATERIALS, ALUMINISING, MIRROR BOX, RONCHI, LASER, FOUCAULT, The primary mirror is a full parabola and the secondary is a hyperbola. Custom Blanks: Different shapes and sizes are available. Let us know your specifications
  3. D203F800 Primary mirror + secondary mirror Mirror Set for Astronomical Telescope. C $168.74. Was: Previous Price. C $177.62. Buy It Now. Free Shipping. Only 1 left

Video: Obsession Telescopes / Optic

Nasa's Hubble successor and most advanced telescope JamesHome | Richard F

Buy Telescope Mirrors - Jim's Mobil

Keck telescope primary mirror segments: fabrication and support. Mast, T. S. ; Nelson, J. E. Abstract. The fabrication of the mirror segments and segment support systems for the Keck Telescope are currently in progress. High quality mirror blanks are being manufactured and delivered by Schott Optical Technologies on a regular schedule First, remove the primary mirror by undoing the screws around the rim of the telescope base and taking out the primary mirror cell. The mirror is held into the cell with three or more mirror clips, which are usually retained by two small bolts. These can be removed to release the mirror

Galaxy Optic

The focal length of the objective lens or mirror of a telescope influences the total length of the telescope. Ad: AstronomyWear.com. The f/ratio in photography means the same for telescopes. It is the focal length of the telescope divided by its aperture. One of the most common telescope designs is a 120mm aperture (4.7) refractor with a. The telescope was equipped with a primary mirror with a 450-mm clear aperture composed of Zerodur and lightweighted at a ratio of approximately 50% to meet both thermal and mass requirements. Reducing the astigmatism was critical for this mirror. The astigmatism is caused by gravity effects, the bonding process, and deformation from mounting. Best prices on Telescope primary mirrors in Binoculars & Telescopes. Check out Bizrate for great deals on popular brands like Celestron, Konus and Meade. Use Bizrate's latest online shopping features to compare prices. Read product specifications, calculate tax and shipping charges, sort your results, and buy with confidence


The telescope tube of a Dobsonian is like all Newtonian reflectors. Plus the optical assembly of both is much the same, where light enters the tube and is picked up by the primary mirror (objective lens), which reflects it on so that the light is concentrated onto the smaller secondary mirror (which is flat) and then finally into the eyepiece For these applications, primary telescope mirrors are designed with many smaller mirrors segments which together equal the light gathering of a single, large mirror. An example is the European Extremely Large Telescope (ELT), which, when complete, will use nearly 800 hexagonal segments for its primary mirror MIRROR CELL: One of the most critical parts of a telescope is the mirror cell. Whether the mirror is flat on its back when the scope is pointed at zenith, or almost vertical when pointed at the horizon, the mirror cell has to support the mirror perfectly. Even the slightest deviation and the image at the eyepiece suffers greatly Telescope Mirror Blanks Providing telescope mirror blanks and kits to telescope makers. Mirror blanks are individually tested for internal strain. Plastic protractor inserted under a 6 inch mirror blank during a stress test, to illustrate what stress would look like - if there were any present Newtonian Telescope Mirrors . Standard full-thickness parabolic Newtonian primary mirrors 8 through 16 in diameter and the NEW! conical cross-section mirrors. Autocollimation tested to have an RMS of .032 and a Strehl Ratio of .96 or better at the Wave Front. Quotes on custom mirrors available as well

Schmidt-Cassegrain Vs Reflector Telescopes - The Main

The resolution of a Newtonian telescope will improve by forcing ambient airflow over the primary mirror, usually with one or more small fans. When the optical face of the mirror is even 1-2 ºC (2-3 ºF) or more above the ambient air temperature, observable image degradation will exist. (My September 2000 Sky & Telescope article describes how. AR Gemini. Our new telescope Gemini combines the advantages of the classic Dobsonian mount, but with an improved, lightweight and easy to assemble truss design. Optics. The mirrors for all of our models have an interferometric test certificate, which guarantees high quality. The Strehl ratio of the parabolic surface is above 95%. Telescopes

The primary mirror is the large mirror at the back end of the telescope tube. This mirror is adjusted by loosening and tightening the three screws, placed 120 degrees apart, at the end of the telescope tube. The secondary mirror (the small, elliptical mirror under the focuser, in the front of the tube) also has three adjustment screws There are telescope companies that will build a scope around these mirrors like Webster Telescopes. Since the primary mirror wooden crate is large & heavy (around 100 Lbs) I would prefer pickup if possible. Payment by cashier's check or cash only. Price is $10,000 for both mirrors together A quantum leap in optical performance - the UL 20 Truss Dobsonian telescope's huge 20 diameter primary mirror gathers more than 6 times more light than popular 8 reflectors or almost three times of the light grasp of a 12 telescope. A Premium, Light, Compact and Portable Design - About half the weight of traditional Dobsonian telescopes The secondary mirror reflects the light from the f/1 primary mirror and converts it to an f/15 beam for the science instruments. The mirror is 3.1 meters (10 feet) in diameter, as large as the primary mirrors of many telescopes currently in use. It will be mounted in a steel mirror cell that contains the axial and lateral supports for the mirror

Swayze Optical! - Home Pag

How to Make Your Own Telescope Mirror: [Fig 1] This is a large piece of glass a woman off Craigslist gave me. It was 40x40 and 0.75 thick. Its what I decided to use to make the mirror. Cutting it into smaller sections can be difficult but scoring it with a glass cutter Everyone involved in building giant telescopes agrees that the solution is to make the primary mirror out of multiple smaller mirrors. Multiple pieces of glass are shaped and aligned to form one. The telescope comes with a matching mirror case - it is designed to allow easy removal of a truss pole to facilitate reaching in and removing the 21-pound primary for travel or indoor storage. Above: Sixteen inch mirror cell with optional knurled brass collimation knobs Here is the primary mirror as removed from the telescope in an earlier stage of rebuilding. A small amount of soap flakes (check the manufacturers guide) are added to hot water and mixed well until the water is foamy Buy primary and secondary mirrors. Available now 10 and 12 diameters: 3-, 6-, 9- and 18-point flotation mirror cells. SPECIAL NOTE: I'll install a complete Sky Commander digital setting circle system on your telescope for $499 (completely configured and ready to use)

Telescope Mirrors, Astronomical Mirrors, Reflector

A primary mirror for a large telescope requires a very precise surface, leading to designs in which the primary mirror is composed of a number of smaller, easier to manufacture mirrors or panels. Changing environmental conditions for Many are surprised to find out that the primary mirror for an R-C is only 1.04167 times more corrected than a parabola. The things that make an R-C difficult are the typically fast focal ratio of the primary that is often used to gain a relatively fast telescope and the significant correction that must be applied to the secondary mirror as a. The design must also account for back focus distance or the distance from the primary mirror to the focus plane behind the telescope to accommodate the focuser, star diagonal, and eyepiece. Considering the primary mirror focal length, the shortest, or fastest focal ratio generally accomplishable by an advanced ATM is f/4 Add amount listed below to Supremax mirror pricing for a quartz Zambuto mirror. Thicker quartz is available in all sizes with prorated pricing per thickness. 8 at 20mm edge thickness add $290.00. 10 at 25mm edge thickness add $390.00. 11 at 25mm edge thickness add $440.00. 12.5 at 25mm edge thickness add $550.00 A brief explanation of the steps required for to cleaning the mirrors within your reflector telescope would go as follows : Step 1: Remove the primary and secondary mirrors using screwdrivers, an allen key and pen. Step 2: fill up a bucket with lukewarm water using a couple drops of detergent and allow your mirror to sit in it for 5 minutes

DIY TELESCOPE primary mirror off-axis TESTING - YouTube

The GMT's mirrors are being produced by the Richard F. Caris Mirror Lab of the Steward Observatory of the University of Arizona. The GMT's 24.5 meter primary mirror will be comprised of seven separate 8.4 meter diameter segments. Each of the primary mirror segments weighs approximately 17 tons and takes a year to cast and cool The mirror is coated on the surface of the glass, called a First Surface Mirror; the coating is usually molecules-thick coating of Aluminum or Silver. Household mirrors are coated on the back of the glass, called a Second Surface Mirror. Reflector telescope types differ based on what happens to the light after it is reflected from the primary Concave Telescope Primary Mirror - 7.5 Diameter (+ Secondary 35 mm) ready for use primary mirror for large telescope build. Refurbished. C $259.62. 0 bids · Time left 1d 7h left. or Best Offer +C $51.92 shipping. from United Kingdom. I 9 E S p O o n R E s Q H O o 8 P r e d. 24 f/3.3 Sandwich Parabolic Telescope Mirror . Brand New

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