Hi, the human eye haven't a shutter curtain, the light arrives to the eye continuously (except when we close the eyes ... ¬ ¬), and the iris acts as a diaphragm, wich reduces the quantity of light arriving at the photo-sensible cells. As of you, I don't think that the human vision can be related to a "frames per second" concept, I think that a more closer concept is to think about the response times that each photo-sensible cell in our eyes can give, wich is a value I don't know of. Another thing is te supposed diaphragm apertures of our iris, you said between f5.6 and f16, and I don't know, but the fact is our eye has en extraordinary wide latitude. You can see at a very bright part of an scene and still perceiving details on other zones wich are in shadows, perhaps more than 10 f-stops. Taking the test is easy and fun: On a sunny day, localyze an scene with very bright sun on one side, and a shadowed zone on the other side. While watching at the lighted part, and without moving the eyes, you can see that you are seeing also details in the shadowed zone. A photo taken at the same scene, exposed to not burn the lights, will not show any detail in the shadow areas. This is a very interesting discussion. Maybe I'm wrong in something! __________________ Llorenç Herrera Aznar http://www.lorenzoherrera.com http://www.fotopunto.com -----Mensaje original----- De: owner-photoforum@xxxxxxxxxxxxxxxxxxxxxx [mailto:owner-photoforum@xxxxxxxxxxxxxxxxxxxxxx] En nombre de ADavidhazy Enviado el: martes, 12 de abril de 2005 13:25 Para: List for Photo/Imaging Educators - Professionals - Students CC: andpph@xxxxxxxxxxxxxxx Asunto: 24 fps in question k et al, :) > I think from memory the human eye has an effective aperture range from > about f5.6 to around f16, we supposedly 'see' at 24 frames per second.. A high school teacher once told me that we see at 24 fps ... I never forgot this because he was, in my opinion at the time, just wrong. The fact is I am not bothered much by such minutia anymore but I should like to note that we see not in intermittent fashion as implied by "fps" but that our vision, our perception of reality, is continuous. We can be "fooled" into believing that a stream of images that differ slightly from each other when presented to our eyes produces the sensation of continuous motion and "flickerless" presentation when the frequency equals or exceeds 24 fps. But that does not mean we see at 24 or whatever frames a second. :) need some coffee ... g'day! andy
