WEBFeb 14, 2015 · It's easy to tell with a mark on the edge of the mirror, and often even from the "flower" pattern in the cerium oxide. I rotate the mirror on the table often. During figuring I make sure to put the mirror back on the table in a different orientation after testing. Just finished a " f/3 that was pretty thin (" edge) and it turned out fine.
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WEBStart with one of our telpe mirror kits. Each kit comes with a telpe mirror blank and all the abrasives (silicon carbide grits and white aluminum oxide powders), cerium oxide polish and pitch to grind and polish it to your specifiions. Please note that our kits do not include a grinding tool or pitch lap.
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WEBAug 29, 2007 · aluminium telpe mirror posted in Beginners Forum (No Astrophotography): In amateur telpe making, telpe mirrors, as I understand the process, are made by rubbing two vertically stacked disks of glass against one another until the lower disk has the desired concave shape. The mirror is then polished smooth and .
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WEBJan 15, 2017 · A 6" f/8 mirror has a sagitta of so defocus by about on a telpe of those dimensions and assess the image quality. For an 8" f/7 you will need to defocus by about I am sure that you don't even need to do the exercise to know the loss of detail that these defocus amounts would produce. Nigel.
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WEBMay 19, 2021 · The mirror couldn't be spherical. Correct me if I'm wrong, but manipulating a sphirical mirror in this way, and have it still produce an image, could only result in a parabolic shape. The only test in the above document was to test separate parts of the mirror to determine image quality. He would set up the mirror into a telpe.
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WEBThis kit includes an 8 inch telpe mirror blank, all the silicon carbide grits, white aluminum oxide powders, gugolz pitch, and cerium oxide polish you will need to grind and polish an 8 inch telpe mirror all bundled in one spot. This will get you on a great start to building your own telpe. Skip to the end of the images gallery.
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WEB410 votes, 43 comments. 151K subscribers in the telpes community. The home to all amateur astronomers telpes! ... The slightest unwanted stress on the mirror during grinding and you're basically grinding against a shape that isn't representative of its natural resting shape, leading to astigmatism, zones, or overall inaccurate figure. ...
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WEBThe two most common beginners' mirrors, the 6" f/8 and 8" f/6, both have 48" focal lengths. Use this formula to calculate your target sagitta: Sagitta (s) = Mirror_Radius2 / ( 4 × Focal_Length ) = r2 / 4F. or use our Telpe Formula and Design Comparator to do the math for you. If you have measured a Sagitta and want to know the resulting ...
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WEBAfter hogging the mirror blank to depth, the rough grinding stage begins. In this video I am grinding with 60/90 grit. The wets are lasting about 90 second...
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WEBAnother way to look at is to consider how many waves of light the mirror needs to remove in going from spherical to parabolic. A 10 inch [25cm] F5 changes by waves of green light either by lowering the center or by lowering the edge. Parabolizing by lowering both center and edge removes waves of glass.
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WEBFeb 16, 2021 · Grinding a Large Thin Mirror # Introduction # Years ago amateur telpes were made with mirrors of a relatively modest size. 6 and 8 inch telpes were considered large. A 10 inch telpe might be the envy of a club or observing group. In the recent past people have learned how to make large mirrors. This started with the .
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WEBr/telpes A chip A close button. Get app Get the Reddit app Log In Log in to Reddit. Expand user menu Open settings menu. Log In / Sign Up ...
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WEBMay 7, 2020 · Read Jean Texereau, How to Make a Telpe, even if you do find a good mentor to work with. It's a classic, very well written and the methods he describes are still spot on, in year 2020. I would recommend NOT starting with a thin mirror, a really big mirror, or a really fast mirror. An 8 inch f/6 or even 6 inch f/8 is a great starting point.
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WEBSharing how I made a simple turntable to grind a telpe, I share the mirror kit I bought 6in plate glass with various carborundum grits. Ne...
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WEBPanasonic HDCSD60 Telpe mirror grinding machine, Grinding 10" pyrex blank for telpe mirror. Newport Glass Works, LTD. Grinding, Polishing and Figuring .. Grinding, Polishing and Figuring . Thin Telpe Mirrors . Abridged from an article appearing . are several ways to support the grinding and polishing .
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WEBThe first thing I built was an extension that sits in the middle of the turntable to raise the working surface above the height of the dam. It was made from an 18 inch diameter tabletop and some scrap lumber. I drew concentric circles on the top of the tabletop in the sizes of common telpe mirror blank diameters.
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WEBCutting telpe mirror blanks out of a thick glass tabletop ... This is my homebuilt edge grinding machine for grinding down my homecast mirror blanks. Click to see the whole project. This is a inch diameter, inch thick, lightweight honeycombback telpe mirror blank that I made myself. The blank only weighs 10 lbs, 4 oz.
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WEBSep 20, 2023 · A Newtonian telpe, invented by Sir Isaac Newton, is a type of reflecting telpe. Newtonian telpe uses a concave primary mirror and a flat secondary mirror to gather and focus light from distant celestial objects. Newtonian telpe is known for its simple and efficient design, making it popular among amateur astronomers.
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WEBf// – € f// – € protected silver coating +€ * costs. Contact us for prices of any diameters which is not listed here or for thicker mirrors. Here you can see the independent test results of two of our telpe mirrors. The test is made by the famous expert Wolfgang Rohr.
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WEBThis is the focus of all your work you will turn this flat piece of glass into an accurate parabolic telpe mirror. We recommend a full thickness Pyrex blank for mirrors up to to 12" in size. ... in various grades, are used as an abrasive between the mirror and tool to grind the glass. Pitch is used to make a soft, conforming pitch lap for ...
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WEBWe would like to show you a description here but the site won't allow us.
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WEBAstronomical (mirror blanks, kits, grinding polishing material, finished components, supplies) Bent or Slumped Glass ( for instrumentation, fixtures, helicopter light covers, camera windows, telpe mirrors, infrared mirrors, etc.) Chemically Strengthened Glass. Colored Optical Filter Glass (by manufacturers)
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WEBGrinding,Polishing and Figuring Part 2 Polishing. 8610 CENTRAL AVE, STANTON, CA 90680TEL. * FAX * EMAIL Thin Telpe Mirrors. Part 2 Polishing. Abridged from an article appearing in Telpe Making #13 Provided: Courtesy of Astronomy .
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WEBMay 7, 2011 · It gives detailed information on mirror grinding and on building three different telpes, including a 10inch Newtonian and a 12inch Cassegrain. The prose is a bit formal, perhaps due to its translated (from French) origin. The Dobsonian telpe is given only a cursory treatment, but over all, this is still a pretty good book.
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WEBMay 2, 2008 · Mark. MirroroMatic and fixed position tool grinding posted in ATM, Optics and DIY Forum: I plan on using a MirroroMatic type grinding machine soon. The fixed position technique Mark Cowan uses is one I’m very interested in. Mark has spoken about this to me and on this forum, as recently as today in the thread “Grinding my .
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WEBThis grinds out imperfections from the casting process to make the mirror smoother and more reflective and helps to grind a more accurate curve into the mirror. Artist Terry Kubecki Pearce, an expert in handgrinding telpe mirrors, was the man for the job. Nowadays telpe mirrors are made from glass which is ground into shape before ...
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WEBThis exercise is not intended to make a perfect piece of optics, but just to show the principle of the methods used in practice and to convince our students that amateur telpe making is surprisingly simple and accessible. Further technical details may be found in many books on amateur telpe making.
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WEBNov 17, 2023 · Dielectric Coatings. Silver Coatings. Standard aluminum coatings are by far the most common coatings for mirrors today, and most mirrors have either standard aluminum or aluminum that has been slightly enhanced chemically. They're deposited on the mirror in a vacuum chamber in one go, and the typical reflectivity is around 8993%.
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