optics and vision

online

• Notes on the Resolution ... of the Human Eye : http://www.clarkvision.com/imagedetail/eye-resolution.html

• Jess says http://www.photonhead.com/simcam/shutteraperture.php - simulation of all this

• focus
  • wikipedia: focus
  • wikipedia: focal length
  • wikipedia: depth of field
  • wikipedia: f-number
  • human eye's focal length is about 1.7cm

• f-number :
  • f/2.8 means "focal-length/opening-diameter=2.8".
  • Each f-number is half as much light: f/1, f/1.4, f/2, f/2.8, ... in factors of sqrt(2).
  • Larger numbers mean less light.
  • Larger numbers give more depth of field
  • resolution constrained by
    • diffraction at high f (light at edges of aperature)
    • aberration at low f (multiple paths through lens)
    • modern lenses best around f/5.6-8; older lenses f/11.
    • photojournalists quote: "f/8 and be there"
    • human eye: f/8.3 (bright light) - f/2.1 (dark)

• color
  • wikipedia: color temperature
  • wikipedia: rgb color model
  • wikipedia: cmyk color model
  • wikipedia: truecolor
  • wikipedia: web colors

add your own here