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Re: [ATM] Lurie-Houghton telescope update

Hi,

Have to agree with Richard! That's the way it is with refracting convex 
surfaces. More work because lenses have two sides but definitely doable 
for us ATMs. And to make something by yourself, that's make the hobby 
interesting...

Regards,
Aki




Richard wrote:

>Hi Ukyo,
>
>Tuesday, November 8, 2005, 4:38:27 PM, you wrote:
>
>UC> It is not easy for an ATMer to make and test convex surfaces
>
>I have to disagree with that statement, especially with the LH
>elements. The whole point of the LH principle is ease of
>manufacture because for the two elements, each have a matching
>convex/concave/ surface with the other. Plus, the surfaces are
>spherical so no figuring and they refractive and so have
>accuracy requirments probably a factor of 4 less than reflective
>components. So, a hyperboloid convex reflecting surface -
>difficult, but far from impossible for the amerture. A spherical
>refracting convex surface?. Easy, anybody who has made a small
>mirror could tackle it.
>
>  
>

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