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Marc - I would start with http://www.surplusshed.com....I've used  
them in the past and they have been very helpful
	


On Jun 25, 2009, at 4:41 PM, Marc Taylor wrote:

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> I'd like to make a big version of a Galilean telescope for the  
> exhibit hall behind the planetarium. I have plano-convex and plano- 
> concave lenses from a optical bench kit, 50mm diameter, focal  
> length 50cm, but it's been suggested that a larger lens by used,  
> say 10cm, with a similar half-meter focal length.
>
> Most of the kits I've seen come with 50mm lenses. Anyone have  
> suggested sources for larger, optical-quality glass lenses?
>
> Marc Taylor
> Coordinator, Andrus Planetarium
> Hudson River Museum
> 511 Warburton Avenue
> Yonkers, NY 10701
> 914 963 4550 x223
> Fax 963 8558
> [log in to unmask]
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