04-26-2012, 07:42 PM
[quote name='miro' timestamp='1335426072' post='17781']
Good question. As far as i know the human eye have
1. Different sensitivity on conrner - e.g. look at dark night straight and on perifery. [/quote]
And there also is the difference between the yellow spot and the rest. Density of rods and cones is many times that of any surrounding areas.
Also, at the periphery many have rods only, or very low concentrations of cones. The periphery is typically designed to detect movement, not to see sharp optimally.
Rods. Those are the ones for B&W vision, or luminosity if you like.
And other than CA, lateral CA as described above, the human eye suffers from all the same optical flaws as photographic lenses, often to a worse degree. However, the brain corrects extremely well when we are not specifically looking for the flaws. F.e., the cornea of an eye may have slight protuberances, causing someone to see, e.g., 4 images, some stronger than others. I know, because my left eye happens to have this condition <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />. However, the brain somehow manages to bring hose together to a single image. Quite clever. Humans may even have different optical flaws, or different strengths of these flaws, depending on mood or weather even.
Furthermore, we may have optical aberrations on our corneas, and on our lenses too, just to make things more complex.
All of this generally corrected quite well by the brain,with the exception of myopia, far-sightedness (alkthough that is often not seen as a flaw), and old-sightedness (less flexible lens, causing less good vision close-up and far away).
Longitudinal CA ("bokeh CA") is the least visible of all of these optical aberrations, because our eyes when wide open don't really have a very wide aperture, and PF we don't have either, because we are either blinded by the light, or generally manage to process a larger DR than most cameras. Generallyastigmatism is th emost common aberration seen in the human eye, other than far- or shortsightedness, as astigmatism is caused most often by the cornea not being perfectly spherical, but slightly ellipsoidal or worse.
Kind regards, Wim
Good question. As far as i know the human eye have
1. Different sensitivity on conrner - e.g. look at dark night straight and on perifery. [/quote]
And there also is the difference between the yellow spot and the rest. Density of rods and cones is many times that of any surrounding areas.
Also, at the periphery many have rods only, or very low concentrations of cones. The periphery is typically designed to detect movement, not to see sharp optimally.
Quote:2. Human eye has two type of cells - one are color sensitivities another for color. One was called cones another just forget the name /from biology class/
Rods. Those are the ones for B&W vision, or luminosity if you like.
Quote:Greetings,
Miro
BTW: There is big percentage of people that are color blind. Even more - the men suffers more than women.
Just my
And other than CA, lateral CA as described above, the human eye suffers from all the same optical flaws as photographic lenses, often to a worse degree. However, the brain corrects extremely well when we are not specifically looking for the flaws. F.e., the cornea of an eye may have slight protuberances, causing someone to see, e.g., 4 images, some stronger than others. I know, because my left eye happens to have this condition <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />. However, the brain somehow manages to bring hose together to a single image. Quite clever. Humans may even have different optical flaws, or different strengths of these flaws, depending on mood or weather even. Furthermore, we may have optical aberrations on our corneas, and on our lenses too, just to make things more complex.
All of this generally corrected quite well by the brain,with the exception of myopia, far-sightedness (alkthough that is often not seen as a flaw), and old-sightedness (less flexible lens, causing less good vision close-up and far away).
Longitudinal CA ("bokeh CA") is the least visible of all of these optical aberrations, because our eyes when wide open don't really have a very wide aperture, and PF we don't have either, because we are either blinded by the light, or generally manage to process a larger DR than most cameras. Generallyastigmatism is th emost common aberration seen in the human eye, other than far- or shortsightedness, as astigmatism is caused most often by the cornea not being perfectly spherical, but slightly ellipsoidal or worse.
Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....