Both you and I know that there's necessarily more than one photon
hitting the sensor at a right angle. It's kinda obvious since any aperture
opening has a physical area larger than a photon.
Well, sort of. But a strict interpretation of your words immediately
above imply that the light beam is collimated, and we both know it isn't!
The only rays that can impinge on the CCD at exactly 90� is that fine
stream of photons at the precise, exact center of the lens.
All photons passing thru even a .002" radius _outside_ the center are
indeed at an angle, and NOT at 90�...
The point was, Bob forfeited that the light _had_ to strike at an oblique
angle. I just wanted to point out that particular breach of logic.
Could be interesting to calibrate our notion of the term "oblique angle",
btw...:-)
No calibration necessary, IMMHO...
My online dictionary says: "sloping from the horizontal or perpendicular."
The only perfectly straight line of photon travel thru a lens are those
photon passing thru exactly on center, which do hit the sensor at
exactly 90�. All others outside that MUST be oblique to that center line.
Come on, this is physics, not linguistics or law, statements are true with an order of magnitude. The pixels are several micrometers across, this gives a defined allowance for angular deviations even under a lens. The focal point of the lens will slightly shift within the pixel, but still be within it.
DagT
