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Published byMarilyn Newton Modified over 9 years ago
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In Photography, there is an Exposure Triangle (Reciprocity Theory) Aperture – size of the iris opening, how much light come into the “window” Shutter Speed – length of time the image is exposed, how long light comes into the “window” ISO setting – sensitivity of film (sensor) to light
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Three things that affect Depth of Field 1.Aperture / Iris (f-stop). Great or shallow, radiates from original point of focus. 2.Distance of the subject to the camera. The closer the original point of focus, the shallower the depth of field. Focusing on distant points increases the range, even with the same aperture setting. 3.Focal Length of lens (zoom). Wide angle (e.g.35mm) lenses optically pull the viewer “back” from the subject and telephoto lenses (e.g. 100mm) pull the viewer “close up.” Results are similar to changing distance.
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In Video, the shutter remains set Shutter Speed – length of time the image is exposed. (Standard – 1/50 sec or twice the frame speed) Frame Rate – length of time between each exposure. (NTSC Standard – 24 fps or 1/24 sec) After Image – the human eye retains the impression of an image slightly longer than it is exposed to it. Without a visual break between exposures, the images would be seen as a blur.
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In Video, there are other options for adjusting exposure Neutral Density filter Off for no density filter ¼ cuts light intensity by up to about ¼ 1/16 cuts light intensity by up to about 1/16 1/64 cuts light intensity by up to about 1/64 Gain (like ISO) – amplifies the image artificially, does not increase the sensitivity of the sensor, causes visual noise L (0db) best dynamic range M (6db) increases the image amplifier H (12db) increases image amplifier more
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PREPARING TO SHOOT 1.White Balance (WB the button in front of your camera below lens) 2.Make an Aperture - Priority decision by adjusting the camera iris according to your desired Depth of Field (also affected by distance of the subject and focual length) 3.If image is overexposed, add Neutral Density filter to cut the amount of luminosity hitting the sensor. Try to keep your Gain Low, if possible. 4.If image is underexposed, switch the Gain Level to amplify the image, but expect increased image grain. 5.Set your Audio Channels (turn on mic at input, turn on correct input) and Audio Levels (visual check in monitor, around 0dbs) and listen in headphones.
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