lecture 1

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lecture 1
2013-03-09 15:51:16
rtvf 44

rtvf 44
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  1. first major element of the camera
    lens, "glass"
  2. focal length
    distance from the optical center (where the light crosses) of the lens to the front surface of the imaging element (usually CCD imager), measured in mm
  3. long lens
    tight shot, large mm#s, high zoom ratio high shortest focal length
  4. short lens
    wide shot, short mm#s, low zoom ratio low shortest length
  5. zoom ratio
    ratio of the longest focal length (tightest angle) to shortest focal length (widest angle)
  6. long focal lengths
    telephoto lens
  7. common professional studio and ENG lens ratios
    14:1, 15:1, 18:1 and 20:1
  8. common EFP and telephoto sports ratios are
    40:1, 70:1, 86:1
  9. professional lenses are labeled by
    zoom ratio and shortest focal length. canon J14a x 8.5 B. multiply the two numbers to figure out longest focal length (mm)
  10. range extender or teleconverter
    increases focal lengths of a lens but does not change zoom ratio. 2x extender is most common, doubles telephoto capability. cut down amount of light (by 2 f-stops but adjust aperture) and only get a wide shot half as wide as before
  11. depth of field
    subject area shot by the camera that is in focus. specific area starting a certain distance from the camera and extending even further away from the initial focus point
  12. depth of field: focusing forward and focusing backwards
    focusing forward=focusing on something closer to the camera, focusing backwards=focusing on something farther from the camera
  13. 1st variable that influences depth of field
    iris opening/aperture/f-stop setting. tiny opening/aperture=large DOF=high f-stop # (lots of stopping). big opening/aperture=small DOF=low f-stop #  (little stopping)
  14. 2nd variable that influences depth of field
    focal length/lens type-influences DOF most significantly. wide shot=large DOF=short lens (more in focus) tight shot=small DOF=long lens
  15. 3rd variable that influences depth of field
    camera-to-subject distance. large distance=large DOF, small distance=small DOF
  16. most widely used lens in broadcasting
    canon and fujinon
  17. cameras in dempster
    studio A/B- Ikegami HK-388W CCD cameras 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 camera with Canon 14:1 lens
  18. filters
    2nd major element of the camera, alter the incoming light to create a special effect or to compensate for excessive color or brightness characteristics
  19. two places filters are located
    1. before-the-lens, an add-on assembly called a matte box attaches to the hood of the lens and allows for specialized drop in filters 2. after the lens, within the camera body in the filter wheel
  20. 1st use for filters
    special effects: star, image inverter, fog/diffusion, cross, multi-image, and center sharp filters, usually before the lens, rarely used
  21. 2nd use for filters
    color temperature adjustment, generally reduce high color temperatures to lower levels (blue to ideal to red), located after the lens in filter wheel
  22. 3rd use for filters cutting down on large amounts of light
    neutral density filters, after the lens in filter wheel, cuts down on excessive sunlight, manipulate DOF