Photo Final Blog Post
Diaphragm- Diaphragm- The diaphragm is what is used to adjust the amount of light that passes through the aperture. A higher f-stop will let less light in while a lower f-stop will let more light in. A series of leaves in the lens increases of decreases the opening. The f-stop numbers are 1.4,2,2.8,4,5.6,8,11,16,22, and 32.
Shutter Speed- The shutter speed is how long the shutter is open during an exposure. Varying the shutter speed controls the pictures exposure to light. If you are taking a picture at night, where there is very little light the shutter speed will be very slow allowing as much light as possible to get in. For daytime shooting or shooting in situations with optimal lighting, you would use a very fast shutter speed therefore letting less light in. If you have a medium amount of lighting your shutter speed will be somewhere in the middle. Speeds range from 1 second to 1/2,000 .
Depth of field-The depth of field usually is referring to the fact that there is a very sharp part of an image as well as a blurred part of an image. This contrast is essentially the depth of field. A few things determine the depth of field; camera to subject distance, the focal length of the lens, the f-stop number as well as the size of format.
Iso-In film photography the ISO or ASA is how sensitive to light the film is. So for example in class we are using a 400 asa film which is for outdoor photography. The lower the number the lower the sensitivity of the film and the finer the grain. Generally there are four things you need to focus on when deciding what iso to use; light, grain, movement and whether or not you are using a tripod. A higher iso would be needed in museums and concerts and things with low light.
Kelvin-Kelvin is the unit in which color temperature is measured. Indoor light is 3200 degrees kelvin and outdoor light is 5600 degrees Kelvin.
Light Meter-The light meter is usually inside your camera yet you can get external light meters as well. It is there to tell you if the light coming into your camera is enough light for the photo. This allows you to change your shutter speed or aperture settings in order to have a good picture. You can change accordingly depending on what the light meter says.
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