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Light Transmission |
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Chris Farris
TEAM SWFA - Admin swfa.com Joined: October/01/2003 Location: Texas Status: Offline Points: 8024 |
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Posted: April/21/2005 at 11:32 |
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koshkin
MODERATOR Dark Lord of Optics Joined: June/15/2004 Location: United States Status: Offline Points: 13182 |
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A good article all in all.
A couple of comments though.
No mention is made of wavelength of light. Our eyes have different sensitivity at different wavelegnths. The claim that a human eye can only detect a 3% difference in brightness is incorrect and depends on a number of factors: wavelength, total light intensity and ambient illumination are the ones that come to mind. For example, in a low light environement, a human eye can resolve slight illumination differences a lot better than in bright sunlight.
Also, perceived brightness of a scope depends on the resolution of the image. I think Dail Clifford has once posted a lengthy discussion of transfer functions. I was too lazy to go through it in detail, but Ihave some exposure to these matters through my work (I am an optical physicist and work with light sensors for various military and astronomy applications). It all boils down to this: a clearly defined picture with sharp edges will seem brighter to you than a hazy one (Leupold newly released filters utilize that phenomenon).
All in all a good article though.
Ilya |
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Chris Farris
TEAM SWFA - Admin swfa.com Joined: October/01/2003 Location: Texas Status: Offline Points: 8024 |
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