ISO speed

(redirected from ISO setting)

ISO speed

The international standard measurement of a camera's sensitivity to light, often simply called the "eye-so." For analog film cameras, the ISO is the "film speed," which is based on the chemical composition of the film. Changing ISO means loading a film with a different speed. With digital cameras, it can be changed by selecting a speed from the ISO menu, reconfiguring an electronic circuit that emulates film speed.

If the camera's shutter speed and aperture cannot be altered for certain scenes, changing the ISO is a third variable that can accomplish the desired exposure. In a digital camera, ISO can be set manually or automatically.

High ISO Noise
In a digital camera, higher ISO speeds are accomplished by amplifying the electronic output of the sensor, and some cameras have speeds up to ISO 10,000. However, the more signals are boosted, the more noise is generated, which is equivalent to the grainier image that appears in analog film at ISO 1600 and higher.

Unless a grainy effect is desired, shooting at ISO 64 and ISO 100 has always been the recommended norm. However, each generation of digital cameras is able to use a higher ISO with less noise, and higher and higher speeds are routinely used. Some digitals have ISO speeds up to 6400 and more, and most cameras also have high ISO noise reduction (NR) circuits that can be selected to help smooth the resulting images.

ISO ratings are equivalent to the original American Standards Association (ASA) film ratings; for example, ASA 100 is ISO 100. The ISO speed may also be designated with its DIN equivalent, which is popular in Europe. For example, ISO 100 can be stated as 100/21º and ISO 400 as 400/27º.
Mentioned in ?
References in periodicals archive ?
The RED MONSTRO 8K VV sensor in the DXL2 offers a 16-plus stops of dynamic range with improvements in image quality and shadow detail, a native ISO setting of 1600, and ProRes 4K up to 60 fps.
While an eclipse scene might be dark overall, tricking your camera to use a high ISO setting, the detail you're generally trying to capture, including the corona, is bright enough to record well with a lower (and thus low-noise) ISO setting.
A lower ISO setting is used when capturing overly bright scenes, since it reduces the light sensitivity of the image sensor.
Be sure to set your camera to a high ISO setting to maximize the camera's sensitivity to low light levels.
Display Indicators: Self-timer Indicator, White Balance Mode, Shutter Speed, Shooting Mode, Iso Setting, Focus
Longer exposures will be required once the Moon is completely covered in shadow and the camera's high ISO setting and remote shutter release that avoids vibration will be helpful.
Today I take almost exclusively digital images, and generally work with only four basic features on my camera: aperture priority mode, shutter priority mode, ISO setting, and exposure compensation.
1 aperture and a 1600 ISO setting for very low light.
Smart Sensitivity Control (SSC) is similar to adjusting the ISO setting in digital photography.
With a tripod-mounted camera, lens (usually a wide-angle) at full aperture and a high ISO setting, the observer hopes that a bright meteor will flash through the field of view while the shutter is open.
Motion Detection automatically detects moving subjects and adjusts shutter speed and the ISO setting to compensate for camera shake and subject movement.