The shutterspeed determines how long the sensor is exposed to light. Normally this is achieved by a mechanical shutter between the lens and the sensor which opens and closes for a time period determined by the shutterspeed. For instance, a shutter speed of 1/125s will expose the sensor for 1/125th of a second. Electronic shutters [...]
Posts Tagged ‘exposure’
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Metering
August 22nd, 2011 
Andrei The metering system in a digital camera measures the amount of light in the scene and calculates the best-fit exposure value based on the metering mode explained below. Automatic exposure is a standard feature in all digital cameras. All you have to do is select the metering mode, point the camera and press the shutter [...]
Exposure Compensation
August 10th, 2011 Andrei The camera’s metering system will sometimes determine the wrong exposure value needed to correctly expose the image. This can be corrected by the “EV Compensation” feature found in prosumer and professional cameras. Typically the EV compensation ranges from -2.0 EV to +2.0 EV with adjustments in steps of 0.5 or 0.3 EV. Some digital SLRs [...]
Exposure
August 7th, 2011 Andrei The exposure is the amount of light received by the sensor and is determined by how wide you open the lens diaphragm (aperture) and by how long you keep the sensor exposed (shutterspeed). The effect an exposure has depends on the sensitivity of the sensor (ISO sensitivity). Accredited online photography schools can teach you more [...]
Auto Bracketing
June 7th, 2011 Andrei Autobracketing is a feature of some more advanced cameras, particularly single-lens reflex cameras (SLR), where the camera will take several successive shots (usually three) with slightly different settings. Later, the best-looking pictures can be picked from the batch. When the photographer achieves the same result by changing the camera settings between each shot, this is [...]
Aperture Priority
May 23rd, 2011 Andrei Aperture priority, often abbreviated Av (for Aperture value) or A on a camera mode dial, is a setting that allows the user to choose a specific aperture value while the camera selects a shutter speed to match. The camera will ensure proper exposure. This is different from manual mode, where the user must decide both [...]
Aperture
May 16th, 2011 Andrei Aperture refers to the size of the opening in the lens that determines the amount of light falling onto the sensor. The size of the opening is controlled by an adjustable diaphragm of overlapping blades similar to the pupils of our eyes. Aperture affects exposure and depth of field. Successive apertures halve the amount of [...]
AE Lock
May 14th, 2011 Andrei Auto Exposure Lock (sometimes called AEL) is an excellent method of gaining added control over exposure, without losing the speed and convenience of automation. In fact, since most photographers today use some form of auto exposure the majority of the time, an understanding of how AE Lock operates can add a new dimension to their [...]
Histogram
March 4th, 2011 Andrei As we’ve talked in the previous topics about sensors and pixels, each photo is composed of a number of pixels. Each of these pixels have a certain level of brightness, ranging from 0 (black) to 255 (white). A histogram is a graphical representation of these levels of brightness for the entire photo.
Night Photography – Equipment and Exposure
November 29th, 2010 Andrei As I said in the last post, taking top quality night photos can also be achieved with just basic equipment. Since almost all of compact cameras have an automatic night mode, they can be used for taking night photos. Many of these cameras also have a complete manual mode for advanced users where you can [...]
