Exposure Basics, lesson three?

Started Mar 18, 2013 | Discussions thread
richarddd
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Re: Answer:
In reply to Great Bustard, Mar 21, 2013

Great Bustard wrote:

Myself, I tend to think that the correct understanding is the more simple understanding:

  • Exposure is the density of light falling on the sensor.
  • Wider aperture and/or longer shutter speed means more exposure.
  • Greater exposure, larger sensor, and/or more efficient sensor means more light recorded.
  • More light recorded means less noise.
  • Sensors can absorb only so much light, beyond which you will get blown highlights.
  • Camera's ISO setting adjusts the brightness of the LCD playback and/or OOC jpg, as well as influencing the camera's choice of f-ratio, shutter speed, and/or flash power depending on the AE (auto exposure) mode you are using.
  • Image files have a limited bit-depth, so increasing the ISO may push portions of the photo outside the range of the image file, resulting in blown highlights.

Is it really that confusing?

  • More light on the sensor mean less noise
  • More light on the sensor makes the image look brigher
  • Wider aperture or longer shutter speed means more light on the sensor
  • Too much light will get blown highlights
  • A higher ISO setting makes the image look brighter
  • Too high an ISO setting will get blown highlights
  • If you're in an auto mode, a higher ISO setting will cause the camera to change aperture or shutter speed, lowering the amount of light on the sensor, increasing noise
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