Notes0405 - Honors 208W Fall 2011 Light, your Camera, and...

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Unformatted text preview: Honors 208W Fall 2011 Light, your Camera, and your Photos The Stargates Iris- Stargate SG-1 otes 2005-2011 : Evan Golub (egolub@acm.org) iewfinders (film cameras) There are two typical types of optical viewfinders: A single-lens reflex (SLR) camera allows you to see through the lens (almost) exactly what the film will see when you take the picture. A point & shoot camera typically provides an optical viewfinder that shows an approximation of what will be seen by the film. otes 2005-2011 : Evan Golub (egolub@acm.org) iewfinders (digital) There are three common types of viewfinders on digital cameras: An LCD preview screen on the back of the camera showing you what the sensor sees. An electronic viewfinder (EVF) in the traditional viewfinder position showing you what the sensor sees. Note: With the above two you are possibly seeing this image on a relatively low-resolution screen, so it might not be as useful as an SLR. A Digital SLR that acts in the same was as a film SLR. There are some dSLR cameras with live preview EVF (like the Olympus E-10 and E-330). eam Splitters A technology that has been around for a number of years but which has the potential to become more mainstream is a beam splitter mirror which sends most of the light to the sensor but some of the light to a viewfinder or to an auto-focus sensor. The Sony A77 uses a pellicle mirror to send some light to an auto-focus sensor and the rest to the real sensor. (It also uses an EVF.) otes 2005-2011 : Evan Golub (egolub@acm.org) otes 2005-2011 : Evan Golub (egolub@acm.org) hat ISO numbers mean (I) hen purchasing film, you would buy a roll with a specific ISO rating based on the type of lighting conditions in which you expected to be shooting. A smaller number meant lower sensitivity to light, thus would generally require brighter conditions. Less sensitivity would also tend to mean less graininess (or visual noise) in the captured image. ith digital cameras, you set the ISO to specify how sensitive you want the image sensors to be to the light they receive. The same two bullets from above apply here as well. otes 2005-2011 : Evan Golub (egolub@acm.org) hat ISO numbers mean (II) If you use a higher ISO, then you can use a smaller aperture or faster shutter speed, but you might have more visual noise in your picture. One nice thing about digital over film is that you can change the ISO between shots without having to change rolls of film. Cameras with larger sensors historically tended to perform better in terms of noise on high ISO settings. More recently, smaller sensors of higher quality have been made. otes 2005-2011 : Evan Golub (egolub@acm.org) SO and Noise, Hot Pixels At higher ISO settings, digital noise will typically appear more noticeable (slight defects become enhanced). It will tend to be more obvious on surfaces with uniform color....
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Notes0405 - Honors 208W Fall 2011 Light, your Camera, and...

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