Archived posting to the Leica Users Group, 1998/04/29
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Eric Welch wrote: > But in this case, you are no optical expert, and they are. I named one > highly respected one whom I have talked to about this. Arthur Kramer, who > has forgotten more about photography than most here will ever know (and > that's no slam on them!) Yeah. Pity we're not discussing photography, but rather biology. But if you put so much stock in what a photographer say, let me quote form "The New 35mm Handbook" by Michael Freeman. "Perception. The complete coverage of the human eye is approximately 240 degrees, although this varies from person to person. However, with the eye in a fixed position, most of the view is fuzzy and ill-defined, with only a tiny spot covering less than 2 degrees beng completely sharp. Away from this central point of focus, the resolution deteriorates. Now where does 46 degrees come into it? > Whom are we to believe? Just because you post it on the internet? Just > because it's so > easy for you to say it isn't so without backing it up? Does it start to > sound like a Monty Python skit? Ok, I'll back it up with an experiment anyone can perform. 1) Hold out both hands to your sides. Wiggle your fingers and look straight ahead. Most folks can see them wiggling. Therefore the angle of view of the eye is at least 180 degrees. 2) While reading this mail message, concentrate on one word only. Don't move your eyes from that word. You will find you can't really read more than one or so words on either side of the word you are looking at. Therefore the highest perception is only a few degrees of view. Now you show me what experiment to do that shows me that there is something special about 46 degrees. > Well, magnification is the same regardless of whether it's an eye, or a > lens, or whatever. How so? The magnification with a camera depends on how you view the resulting picture. The magnification will be different depending on whether you view a slide, a slide with a 8x loupe, a 6x4" print, a 8x10" print, a 20x24" print and it also depends on how close you view the print. So how are you going to compare the magnification of the eye to that of a camera????????????? > Not it isn't. > > Ah, proof positive! I'm convinced. Now I'll buy that parrotflex. I would have thought you were old enough to know what your eyes can perceive. You don't need two doctorates and a professorship to figure this out. - -- Chris Bitmead http://www.ans.com.au/~chrisb mailto:chrisb@ans.com.au