FreeLists / az-observing / [AZ-Observing] Re: color is not important was Re: How deep can you see?

["cvsc1" <cvsc1@xxxxxxxxxxxx>]

As follow-up and for clarification

Where I stated
>As illumination is increased the cones start to react and discern color while 
>the rods begin to protect themselves by bleaching out the pigmentation within 
>the eye, which is responsible for the increased sensitivity.

This is to imply that a fully dark adapted eye has reached full pigmentation 
level.

And
>Summary:
>If you have enough light intensity to differentiate color your are degrading 
>your light adapted eye-sight.

Should have been 
dark adapted eye-sight.

as follow-up,
the preference toward a light which emits in the red spectrum is attributed to 
shortened exposure time to a more intense light.

Jack still said it best!
have a great day, and a clear night
Stan Clark
33.43N, 112.35 W
Saguaro Astronomy Club
Webmaster
www.saguaroastro.org



---------- Original Message ----------------------------------
From: "cvsc1" <cvsc1@xxxxxxxxxxxx>
Reply-To: az-observing@xxxxxxxxxxxxx
Date: Sat, 14 Dec 2002 15:36:48 -0600

>
>Generalizations from an up-coming article for the SAC web site.
>Taken from lecture notes on Color Theory and the Human Eye.
>
>The eye is comprised of two sets of photo-receptors.
>They are called rods and cones.
>Rods are responsible for illumination intensity.
>Cones are responsible for color.
>The eye is most sensitive to greenish-yellow light, however cones respond 
>quickest to red light.
>
>Under low light levels, the rods are the primary receptors and the cones are 
>in effect not functioning.
>
>As illumination is increased the cones start to react and discern color while 
>the rods begin to protect themselves by bleaching out the pigmentation within 
>the eye, which is responsible for the increased sensitivity.
>
>Summary:
>If you have enough light intensity to differentiate color your are degrading 
>your light adapted eye-sight.
>The reason for the red light, is simple your eye adjusts to it's spectrum 
>quicker, thus improving your adaptation to light.
>
>Color in less important than intensity of light.
>
>Jack put it right when he said
>> I would use dim any color rather than these crimson beacons I see out there 
>> some times. 
>
>--
>have a great day, and a clear night
>Stan Clark
>33.43N, 112.35 W
>Saguaro Astronomy Club
>Webmaster
>www.saguaroastro.org
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