[ATM] infra-red

[Steve Beccue]

Thanks.  Sounds interesting.

Steve Beccue
steve at beccue.com

On Sat, 27 Jan 2007, John Sherman wrote:

> 
> 
> Hi Steve,
> 
> >, but how opaque is the atmosphere to near-IR?   I thought it was a 
> >problem.
> 
> Sure, when looking thru hundreds of miles of air. But night vision devices 
> use near-IR with good results over much shorter distances.
> And as Jarvis noted, cameras intended for normal terrestrial use already 
> have IR-blocking filters (because IR focuses at a different distance from 
> visual).
> 
> I'll bet some enterprising members of this list could build their own night 
> vision telescopes based on Meade's idea.
> 
> John
> 
> 
> 
> 
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