Ahh, thanks for the explanation. <g> Cheers -
george (knuckle dragger) --- Alan Cangemi <ac-t...@msn.com> wrote: > Ahhh, George, > > Now I see the confusion. The old style brains (those used before 1985) did > in fact see lights as individual frames. But the modern brain, especially > those in people born after 1986, see light as a continuous stream. Even > though the old style brains are still manufactured and used (mostly for > economic reasons.the new styled brains cost 4 times as much) most people > nowadays are using the new brains. It's easy to spot those with new and old > styled brains.the old style recipients tend to drag their knuckles when they > walk upright. > > Sorry for the confusion, George. > > Best regards. > > Alan (old style) Cangemi > > > ----- Original Message ----- > From: "George L Smyth" <glsm...@yahoo.com> > To: <pinhole-discussion@p at ???????> > Sent: Monday, January 06, 2003 8:56 PM > Subject: Re: [pinhole-discussion] Human eye > > > > Well, you'll need to speak with my Physiological Psychology teacher of 30 > years > > ago, as that is what our textbook said. We do not see things as > continuous > > streams, but as frames. > > > > Cheers - > > > > george > > > > > > > > --- Alan Cangemi <ac-t...@msn.com> wrote: > > > George. > > > > > > The brain DOES NOT take in light similar to a movie camera's film > mechanism. > > > It "sees" light as a continuous stream. It is only through mechanical > > > processes that wheels appear to be turning backwards whilst the vehicle > is > > > moving forward. > > > > > > So there! > > > > > > sreehC > > > > > > Alan > > > > > > > > > ----- Original Message ----- > > > From: "George L Smyth" <glsm...@yahoo.com> > > > To: <pinhole-discussion@p at ???????> > > > Sent: Monday, January 06, 2003 5:53 PM > > > Subject: Re: [pinhole-discussion] Human eye > > > > > > > > > > While light does stream in continuously, the brain takes it in similar > to > > > a > > > > movie camera's film. This is why you may see a bicycle's tires appear > to > > > move > > > > backwards as it goes forwards. > > > > > > > > Cheers - > > > > > > > > george > > > > > > > > > > > > > > > > --- erick...@hickorytech.net wrote: > > > > > Another thing occurs to me. The camera analogy is also limited by > the > > > fact > > > > > that camera shutters open and close, while light streams into the > human > > > eye > > > > > continuously. The operative 'shutter speed" would have to be the > > > duration of > > > > > exposure to the rod or cone required to trigger nerve conduction. I > > > don't > > > > > know whether there is a trasmission period followed by a refractory > > > period, > > > > > which would equate to shutter speed, or not. > > > > > ----- Original Message ----- > > > > > From: <erick...@hickorytech.net> > > > > > To: <pinhole-discussion@p at ???????> > > > > > Sent: Sunday, January 05, 2003 11:30 AM > > > > > Subject: Re: [pinhole-discussion] Human eye > > > > > > > > > > > > > > > > Here is some information I have. How it applies I'm not sure. The > eye > > > is > > > > > > only the aperture, lens and sensing apparatus. Because the eye is > > > attached > > > > > > to the brain it would make more sense to use a digital camera as a > > > model > > > > > > rather than film camera. The mind can read an image and give a > > > response in > > > > > > as little as 0.04 seconds- a professional pingpong players > response > > > time, > > > > > > for instance. Nerve transmission time mind to brain can be > measured by > > > > > > measuring cortical evoked potential responses to visual stimuli. I > > > might > > > > > > have once know the limiting values but I don't recall them. A big > name > > > in > > > > > > research in this area is Meichenbaum, if you want to look it up. > As > > > for > > > > > > aperture, the lens to retina distance is roughly 25 mm. Maximum > pupil > > > > > size, > > > > > > i.e. aperture diameter, is maybe 8 mm in an adult, so the maximum > F > > > stop > > > > > > would be 25/8= 3.1. Minimum aperture would be about 25/2 for > > > 'pinpoint" > > > > > > pupils, an F stop of 12.5. I think that the eye processes light > > > sensation > > > > > > somewhat differently at low light levels, so "film speed" would be > a > > > > > guess. > > > > > > Remember too that the eye and brain cannot distinguish as separate > > > images > > > > > > any sequence more rapid than about 14/second. That is the basis > for > > > movies > > > > > > and television, sequences of still images projected faster than > the > > > eye > > > > > can > > > > > > distinguish, thus blending them into apparent continuous motion. > > > > > > > > > > > > I----- Original Message ----- > > > > > > From: "George L Smyth" <glsm...@yahoo.com> > > > > > > To: <pinhole-discussion@p at ???????> > > > > > > Sent: Sunday, January 05, 2003 10:53 AM > > > > > > Subject: Re: [pinhole-discussion] Human eye > > > > > > > > > > > > > > > > > > > On 22 Jul 2002, at 11:16, eco...@aol.com wrote: > > > > > > > > > > > > > > > I know this is not strictly pinhole, but I wondered if > > > > > > > > anyone had access to the average human eye values for the > > > > > > > > camera variables. ie Respective - film speed, shutter speed, > > > > > > > > aperture, focus range, depth of field etc. Thanks > > > > > > > > Ellis > > > > > > > > > > > > > > > > > > > > > When I looked into shutter speed many years ago, I came upon the > > > > > > conclusion > > > > > > > that the eye's shutter speed is approximately 1/100 second. You > can > > > > > > verify > > > > > > > this by taking successive pictures of a waterfall. We all know > that > > > > > > slowing > > > > > > > down the shutter speed to a second or more will make for silky > > > water, > > > > > > which is > > > > > > > not what we see. From there, take pictures with faster and > faster > > > > > speeds > > > > > > > (don't forget to take notes). When you get the results, compare > the > > > > > > pictures > > > > > > > with what you see and make the decision for yourself. > > > > > > > > > > > > > > Cheers - > > > > > > > > > > > > > > george > > > > > > > > > > > > > > ===== > > > > > > > Handmade Photographic Images - http://GLSmyth.com > > > > > > > DRiP Investing - http://DRiPInvesting.org > > > > > > > > > > > > > > __________________________________________________ > > > > > > > Do you Yahoo!? > > > > > > > Yahoo! Mail Plus - Powerful. Affordable. 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