If the human eye/mind could be translated to camera variables.. then wouldn't it be sad to be laying on ones death bed, and start to reflect on the life we lived.... only to find out we forgot to put film in our camera/head.
think about it. ----- Original Message ----- From: "Gary Nored" <[email protected]> To: <pinhole-discussion@p at ???????> Sent: Saturday, January 04, 2003 11:19 PM Subject: Re: [pinhole-discussion] Human eye > On 22 Jul 2002, at 11:16, [email protected] 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 > > Difficult to answer this one (though some will try) > because the human brain does so much post processing. > Neasurements of eyeball parameters such as resolution > or depth of field are largely meaningless; that is, we see > much better than eyeball specifications would indicate. > > For example, no matter what the eyeball's depth of field, > we perceive our 'depth of field' to be infinite because that > which we attend is always in focus, and the brain fills in > the rest to make it seem so. > > Our 'focal range' changes with age. Young people can > see as close as a few centimeters -- older folks may > struggle with a meter or more. > > Our 'film speed' is continuously variable -- a dark adapted > eye can detect just a few photons yet we can also > operate well on a sunny day at the beach -- this is far > more change than can be accommodated by changes in > our 'f-stop setting' (iris diameter). > > Even our 'shutter speeds' can seem extremely short > because for the most part we see even fast-moving > objects clearly and unblurred thanks to the image > processing our brains do. > > Regards, > Gary Nored > > _______________________________________________ > Post to the list as PLAIN TEXT only - no HTML > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??????? > unsubscribe or change your account at > http://www.???????/discussion/ >
