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Martin Lyons
super member
Reged: 10/06/08
Posts: 102
Loc: Cape Town, South Africa
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Hi Folks,
I have acquired 2 identical, matched mirrors.
They are 310mm diameter, f4.5 65mm thick and have Gold coatings (originally intended for IR work, no doubt)
They were made by the Delft Optical works in the Netherland just before the works was closed down.
The Delft Optical works made specialist optical instruments for both military and medical industries, so there is no doubt in my mind that these mirrors will be figured to a high precision.
Unfortunately, there is no paperwork with the mirrors (got lost over time, no doubt) so I intend to have them tested and certified by our local optical specialists.
My problem is this: What do I do with these mirrors???
I'm not interested in 12" Newtonian binoculars, nor am I really interested in making a telescope (made so many over time that I've run out of energy and rather just buy a ready made scope - my sig bears that out  )
Anyone have any creative ideas? 
Gold plated ashtray mebbe?? 
Any and all suggestions will be considered 
--------------------
Meade 14" LX200R
Celestron 9.25" on CG-5GT
Stellarvue AT-1010
Skywatcher 6" f5 refractor on EQ5
Skywatcher 8" Flex Dob
Westling 25x100 binocs
Towa 339
Too many bits 'n pieces to mention
Edited by Martin Lyons (09/15/09 12:30 PM)
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Stefan Rostyne
Pooh-Bah
Reged: 10/19/04
Posts: 1009
Loc: Assenede, Belgium
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Are they spherical? Are they parabola's? Hyperbola's? Elipsoids?
Also : If they are made for IR work, they may not be well enough corrected for visual work. IR wavelenghts are far bigger then the typical 55nm we're used to for visual. A simple foucault test may give you more information on that.
You may want to sell 'm, or better, donate 'm to a local ATM- or astronomy club? Anyone with a bit handiness and ATM experience must be capable to refigure them into decent mirrors, if they allready aren't.
--------------------
Stefan Van de Rostijne
4.5" F4.5 newt 5°widefield/finderscope
8" f/5.6 travel dob
old 12.5" F5 dob (used to look better...)
30 cm f/30 Classic Cassegrain (polishing primary)
23" f/4 dob project
Edited by Stefan Rostyne (09/15/09 02:55 PM)
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Martin Lyons
super member
Reged: 10/06/08
Posts: 102
Loc: Cape Town, South Africa
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Good questions Stefan, hence my intention to have them tested and get some quantitative and qualitative specification.
Once I've gotten that, I'll have a better idea of what to do.
Maybe, assuming they're decently parabolic and figured for the visual spectrum, I could make 2 scopes for outreach - that'll mean I don't have to cart my SCT's around.
Let's see what transpires.
--------------------
Meade 14" LX200R
Celestron 9.25" on CG-5GT
Stellarvue AT-1010
Skywatcher 6" f5 refractor on EQ5
Skywatcher 8" Flex Dob
Westling 25x100 binocs
Towa 339
Too many bits 'n pieces to mention
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teast
professor emeritus
Reged: 11/10/07
Posts: 500
Loc: Kentucky
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Quote:
I'm not interested in 12" Newtonian binoculars, nor am I really interested in making a telescope (made so many over time that I've run out of energy and rather just buy a ready made scope - my sig bears that out )
Anyone have any creative ideas?
Gold plated ashtray mebbe??
Any and all suggestions will be considered
Yeah, but have you ever made a 12" Infrared Binocular Newtonian Telescope (IRBNewt) ? 
-Tom
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MACandhisCanon
journeyman
Reged: 10/12/09
Posts: 8
Loc: Trobajo del Camino, Spain
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Quote:
I'm not interested in 12" Newtonian binoculars
Why not?, a 12" binocular must me amazing, yes, I know, It can be a very complicated project, but I'm thinking about the images that you can see with a 12" binocular and I need a bib  Yes, I know too, may be you'd need a truck to transport the binocular, but, here in Spain we have a quote, "Walk or not, the donkey, will be better big"
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There is not closed doors, there is not impossible pictures, you only must learn how to do it, or you don't have all what you need
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