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From: Ian Stirling
Subject: Re: Make infrared goggles inexpensively (like $10!!!)
Date: Wed, 18 Sep 2002 21:17:33 +0000 (UTC)
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In sci.electronics.design Joseph Legris wrote:
> "William J. Beaty" wrote:
>> For this application (viewing the outside world,) it might be
>> better to base our definition upon the eye's dynamic range in bright
>> sunlight (obviously not including the extra range which comes from
>> dark adaptation.) Does anyone know this value?
> I recall reading somewhere that the range of optical stimuli perceptible
> to the human eye spans roughly 9 orders of magnitude!
A bit pessimistic.
The light from a magnitude 6 star (visible to most people dark adapted in
good seeing) is around a tenth of a nanowatt per square meter.
The sun is 13 orders of magnitude (decimal) brighter, and yet you can
look at the sun (fleetingly) without damage.
http://inquisitor.i.am/ | mailto:email@example.com | Ian Stirling.
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