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Looking for glass

Milamber

By Milamber
in DIY Astronomer

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Milamber

Milamber

Posted
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Hi all - I need some glass is all, optical quality, about 5" x 2". Can have a slight tint - could even be resin- or acrylic-based - but optically clear is the important thing, two pieces. Anyone got any ideas?

Arthur - not telling yet :)

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barkis

barkis

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I have two of these I was going to use as flats in future large scopes I made, but apart from a 16" f4.5 WIP, and has been for about two years, It's doubtful I will need them.

Octagonal shape, long dimensions are 115mm x 80mm x 10mm thick.

Unfortunately, the uncoated surfaces are very finely ground.

They are optically flat, but to what wavelength I don't know.

I don't know the reason for needing them, but that's your secret.

Your request reminded me I had these. The other one needs to be rescued from a secret place I have forgotten about for the moment.

The small crescent shadow is a shadow, and not a blemish

Ron.

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Milamber

Milamber

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Thanks for the offer, but I should elaborate - these are for looking through, need only be thick enough to keep dirt out and will need to be able to display a projected beam - whilst at the same time letting various laser beams pass unrestricted... In effect, I need transparencey from UV right through to IR! They could even be M/Cycle visor material, but with the proviso that they are flat and will not distort an image.

Arthur

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barkis

barkis

Posted
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Thanks for the offer, but I should elaborate - these are for looking through, need only be thick enough to keep dirt out and will need to be able to display a projected beam - whilst at the same time letting various laser beams pass unrestricted... In effect, I need transparencey from UV right through to IR! They could even be M/Cycle visor material, but with the proviso that they are flat and will not distort an image.

Arthur

Well, a bit of Sodium Hydroxide, a little optical pitch to make a lap, an hours polishing and away you go.:)

I know!, you haven't got time.:)

What about a Flat TV Protection screen. Cut two pieces of one of those. The old analogue ones. Plenty of those about now, the crusher aint got all of em.

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barkis

barkis

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What flat tv protection screen? It does need to have some strength, so got to be stiff...

I am using a Toshiba analogue TV in the Computer room. Connected to a Freeview box of course. The front glass sits in front of the CRT, and is not a part of it, separate glass screen. Looks pretty flat to me, although the eye can't detect small undulations.

It was just a thought.

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Milamber

Milamber

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Well, looks reasonable in the 850-1000nm range for my IR... the UV looks poo but that's not a real requirement - I was only including it because I had the option anyway... Looks good all round though, it has more good than bad at least - though I have been also looking at microscope/specimen slides. Along with that I have also been considering other stuff... but I should be sorted now thanks :)

Arthur

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Milamber

Milamber

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Well, there are hints here and there on SGL if you look for them, both in recent posts of mine and possibly some future ones ... since I cannot right now get to spend time at the workshop (even if I could get in right now) I have to do *something* :)

But I ain't telling until it's finished, so there :)

Arthur

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Wobbly Bob

Wobbly Bob

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Wanted opticaly flat glass, resin or somesuch to FREZNEL LENS. What are you up to Arthur :p I bet you are trying to gather light to all four scopes on the wonder rig :eek:. I have got it :) you are going to put a light house on the new tamac :)

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