rtvf lecture 1

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rtvf lecture 1
2013-03-09 16:27:22

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  1. first major element of the camera
    lens, glass
  2. focal length
    distance from the optical center (where light crosses) of the lens  to the front surface of the imaging element (usually CCD imager), measured in mm. long lens=tight shot=large mm#s. short lens=wide shot=small mm#s.
  3. lenses are often referred to by their
    zoom ratio, longest focal length (tightest angle) to shortest focal length (widest angle) lens.
  4. telephoto lens
    long focal lengths
  5. common professional studio and ENG lens ratios
    14:1, 15:1, 18:1 and 20:1
  6. common EFP and telephoto sports ratios
    40:1, 70:1, 86:1
  7. professional lenses are labeled by
    zoom ratio and shortest focal length, multiply 2 numbers to figure out the longest focal length, mm
  8. wide shot lens
    low zoom ratio, low shortest focal length
  9. tight shot lens
    high zoom ratio, high shortest focal length
  10. range extender or teleconverter
    increases the focal length of a lens but not zoom ratio. 2x extender is most common, doubles telephoto capability. cuts down amount of light (by 2 f-stops). also only gets a wide shot half as wide as before
  11. depth of field
    subject area shot by the camera that is in focus, area starting a certain distance from the camera and extending even further away from the initial focus point
  12. 1st variable that affects DOF
    iris opening/aperture/f-stop setting. tiny opening/aperture=large DOF=high f-stop#. big opening/aperture=small DOF=low f-stop#
  13. 2nd variable that affects DOF
    focal length/lens type. influences DOF most. wide shot=large DOF=short lens (more in focus). tight shot=small DOF=long lens (less in focus)
  14. 3rd variable that affects DOF
    camera to subject distance. large distance=large DOF, small distance=small DOF
  15. most used lens in broadcasting and high end video production
    canon and fujinon
  16. dempster cameras
    studio A/B-Ikegami HK 388W CCD camers with Canon 20x8 box studio lens with 2x range extenders. ENG/EFP-Panasonic AG-HMC80 SDHC cameras with 12:1 lens or JVC GY-HM700U SDHC cameras with Canon 14:1 lens
  17. filters
    2nd major element of camera, alters the incoming light to create a special effect or to compensate for excessive color or brightness characteristics
  18. where filters are located
    before the lens (add-on assembly called a matte box attaches to the hood of the lens for specialized drop in filters) and after the lens (in camera body in filter wheel)
  19. 1st use for filters
    special effects: star, image inverter, fog/diffusion, cross, multi-image, and center sharp features, before the lens, rarely used
  20. 2nd use for filters
    color temperature adjustment: reduce high color temperature to lower levels, after the lens in filter wheel
  21. 3rd use for filters
    cutting down on large amounts of light, neutral density filters, after the lens in filter wheel, used outside to cut down sunlight or inside to manipulate DOF