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ULE Corning Ultra Low Expansion Mirror Blank |  |
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US $300.00 | 9d 18h 17m |
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Zerodur Optical Glass Blank - Lens/Mirror | |
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US $60.00 | 8d 16h 40m |
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Coherent Silicon Mirror Blank 28mm Dia | |
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US $21.95 | 6d 20h 2m |
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Lot of 2 Zerodur Discs Laser Mirror Optical Blanks | |
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US $199.99 | 5d 13h 45m |
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Mirror Blank
Newtonian reflector telescope help? the primary mirror is made by grinding a glass blank, i wanna know?
whether it is possible to use a mirror which is already made into parabolic shape, the thickness of the mirror being 5 mm all the way... take a look at these two shapes :
mirror blank )| 3inch glass grinded and slivered on the flat side
my mirror ) 5 mm thick coated on the side which has the bulge to reflect light on the other side...also is there a way of testing the parabolic shape before silvering the mirror? will heat expansion and contraction affect the mirror i am considering? i ve a mirror which only needs to be coated plz help?
A mirror silvered on the flat side won't work in a Newtonian telescope. You'll get ghost images and chromatic aberration. Also 5 mm is way too thin for a telescope mirror; a 3" mirror needs to be 12 or 13 mm thick to provide adequate support for the reflecting surface. If this is a mirror you've found somewhere (and it sounds like it) it's very unlikely that it has a parabolic surface or that it's figured carefully enough to function in a telescope. It is possible to test its figure using the Foucault knife-edge test, which you can find in any book on mirror making. But I very much doubt that this mirror will provide a satisfactory image in a telescope. Telescopes really need extremely precisely ground, polished, and figured mirrors specifically made for the purpose.
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No items matching your keywords were found.
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ULE Corning Ultra Low Expansion Mirror Blank | |
|
US $300.00 | 9d 18h 17m |
|
Zerodur Optical Glass Blank - Lens/Mirror | |
|
US $60.00 | 8d 16h 40m |
|
Coherent Silicon Mirror Blank 28mm Dia | |
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US $21.95 | 6d 20h 2m |
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Lot of 2 Zerodur Discs Laser Mirror Optical Blanks | |
|
US $199.99 | 5d 13h 45m |
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Blank Chrome Mirror Acrylic License Plate | |
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US $7.99 | 5d 13h 11m |
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Blank Compact Mirror Square | |
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US $3.75 | 29d 9h 28m |
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CELESTRON 14" Mirror Blank,Cast Formed to F/2 Fine-Annealed Pyrex* | |
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US $225.00 | 1d 23m |
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5pc - Blank Mirrored Acrylic Licence Plate - 6" x 12" - CHROME (NEW) | |
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US $29.95 | 29d 23h 15m |
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Blank Mirrored Acrylic Licence Plate - 6" x 12" - CHROME (NEW) | |
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US $7.99 | 2d 16h 19m |
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Blank Black Mirror Acrylic License Plate | |
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US $5.99 | 6d 17h 17m |
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Blank Silver Mirror Acrylic License Plates - Includes Chrome Screw Covers | |
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US $9.95 | 28d 22h 17m |
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Blank Purple Mirror Acrylic License Plate | |
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US $7.99 | 23d 14h 23m |
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Blank Orange Mirror Acrylic License Plate | |
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US $7.99 | 23d 14h 16m |
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Small Blank Metal Compact Mirror Case | |
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US $3.75 | 21d 9h 21m |
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Blank Large Compact Mirror Circle(Pack of 30) $3.99 Blank Large Compact Mirror Circle. Compact mirror is a Silver color and made of metal. Approximately 2.75" x .3/16". Each in own ploy bag. |
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Small Blank Compact Mirror Cases(Pack of 60) $4.99 Small Blank Compact Mirror Cases Mirrors are a Silver tone. Measuring approximately 2.5" diameter and 1/2" thick. |
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Blank Heart Mirror Key Chain(Pack of 50) $2.99 Blank Heart Mirror Key Chain. Silver color. Metal. 1.75" x 1 7/8" |
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Gold Small Blank Metal Compact Mirror Cases(Pack of 50) $4.99 Small Blank Metal Compact Mirror Cases Mirror cases are a gold tone. Measuring approximately 2.5" diameter and 1/4" thick. |
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Thin Blank Metal Compact Mirror Cases(Pack of 30) $3.99 Thin Blank Metal Compact Mirror Case. Approx. 2 3/8" diameter and 5/16 thick. Decorate the top! |
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Blank Aluminum Compact Mirror Heart Silver(Pack of 40) $5.99 Blank Aluminum Compact Mirror Heart Silver Mirrors measure approx. 2.5" x 3". Silver tone. |
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Blank Large Square Picture Mirror Key Chain(Pack of 50) $3.99 Blank Large Square Picture Mirror Key Chain Mirror key chain is a Silver tone. Key chain opens to feature the mirror. Measures approximately 1.75" x 2". |
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Blank Heart Metal Compact Mirror Cases(Pack of 50) $4.99 Blank Heart Metal Compact Mirror Cases. Approx. 2 3/8" x 5/16". Decorate the top! Each in own ploy bag. |
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Wholesale Blank Metal Compact Mirror Cases(Pack of 60) $5.99 Blank Metal Compact Mirror Cases. Silver tone. Approx. 2.75" diameter and 7/16 thick and inner circle approx. 2.25" Decorate the top! |
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Blank Metal Keychain Picture Holder Square(Pack of 80) $2.99 Blank Metal Keychain Picture Holders Square. Mirror inside. Approx. 1.25" x 1.25" Each in own ploy bag. |
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Blank Metal Keychain Picture Holder Circle(Pack of 60) $2.99 Blank Metal Keychain Picture Holders Circle. Mirror inside. Approx. 1.25". Each in own ploy bag. |
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Bob Blank - The Blank Generation $7.49 Bob Blank - The Blank Generation |
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In The Mirror $12.49 In The Mirror |
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Mirror $13.49 Mirror |
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Into The Mirror $9.99 Into The Mirror |
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Mirror, The $12.49 Mirror, The |
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Casting Telescope Mirror Blank
Ever time I look in the mirror, I _________________ ( fill in the blank )?
thank God for eyes to see. Even though the reflection looking back at me is far less than perfect. I am blessed to be here. So I try not to complain about simple physical imperfections and just thank him for the simple things (eyes to see ears to hear and just having life itself.)
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