The ISO in SLR photography is a measurement of the light sensitivity of the film you are using. Understanding what ISO means and how it affects the photos you take isn't just helpful; it's essential for achieving quality shots. When used correctly in combination with aperture and shutter speeds, the proper ISO can produce the perfect photograph.
Definition
The term ISO refers to the International Organization for Standardization and has replaced the former ASA designation. The measurement first was used with traditional film SLR cameras the ensure that different film manufacturers used chemicals that were equally sensitive to light. The ISO measurement also is used in digital photography and refers to the sensitivity of a DSLR camera's light sensor, not film itself.
Lighting
When selecting which ISO to use--whether film for a traditional SLR or an ISO setting for a digital camera--lighting is the most significant variable that determines what you should choose. When the subject and surroundings are well lit, use a low ISO. Even though low ISO film is less sensitive to light, the high light levels will counteract this and leave you with a clear, crisp shot. Use high ISO in settings where light levels are low or where it would be inappropriate to use a flash, such as an orchestra concert.
Motion
In addition to light, the speed and movement of your subject is another important consideration when selecting an ISO for your SLR or DSLR camera. A high ISO setting allows you to use a faster shutter speed. This is because the film needs to be exposed to light for less time to produce a well-developed shot. If your subject will be moving quickly, such as at sporting events or races, a higher ISO will let you use a fast shutter speed while still exposing the shot to enough light to develop. For stationary subjects, use a lower ISO to produce clearer results.
Stability
The stability of your camera makes a difference in which ISO film or setting is selected. A higher ISO allows for a faster shutter speed, which is especially useful when you do not have a tripod or your environment is shaky or unstable. A faster the shutter speed helps the camera avoid picking up movement of your hand. If you are using a tripod with your SLR camera, you can use a low ISO, as jittery hands won't disturb the longer shutter speed required.
Grain
A discussion about ISO in SLR and DSLR cameras is not complete without a caveat about film grain. For low-light, high-movement and unstable conditions, high ISO film may seem like the best choice, but it comes at the price of photo clarity. Because of the chemicals used, higher ISO films will produce much more film grain. The lower the ISO, the finer and less noticeable this grain becomes. Selecting an ISO is all about finding the balance of using an setting that is high enough to produce properly developed shots but low enough to maintain clarity and reduce noticeable grain.
The ISO in SLR photography is a measurement of the light sensitivity of the film you are using. Understanding what ISO means and how it affects the photos you take isn't just helpful; it's essential for achieving quality shots. When used correctly in combination with aperture and shutter speeds, the proper ISO can produce the perfect photograph.
Definition
The term ISO refers to the International Organization for Standardization and has replaced the former ASA designation. The measurement first was used with traditional film SLR cameras the ensure that different film manufacturers used chemicals that were equally sensitive to light. The ISO measurement also is used in digital photography and refers to the sensitivity of a DSLR camera's light sensor, not film itself.
Lighting
When selecting which ISO to use--whether film for a traditional SLR or an ISO setting for a digital camera--lighting is the most significant variable that determines what you should choose. When the subject and surroundings are well lit, use a low ISO. Even though low ISO film is less sensitive to light, the high light levels will counteract this and leave you with a clear, crisp shot. Use high ISO in settings where light levels are low or where it would be inappropriate to use a flash, such as an orchestra concert.
Motion
In addition to light, the speed and movement of your subject is another important consideration when selecting an ISO for your SLR or DSLR camera. A high ISO setting allows you to use a faster shutter speed. This is because the film needs to be exposed to light for less time to produce a well-developed shot. If your subject will be moving quickly, such as at sporting events or races, a higher ISO will let you use a fast shutter speed while still exposing the shot to enough light to develop. For stationary subjects, use a lower ISO to produce clearer results.
Stability
The stability of your camera makes a difference in which ISO film or setting is selected. A higher ISO allows for a faster shutter speed, which is especially useful when you do not have a tripod or your environment is shaky or unstable. A faster the shutter speed helps the camera avoid picking up movement of your hand. If you are using a tripod with your SLR camera, you can use a low ISO, as jittery hands won't disturb the longer shutter speed required.
Grain
A discussion about ISO in SLR and DSLR cameras is not complete without a caveat about film grain. For low-light, high-movement and unstable conditions, high ISO film may seem like the best choice, but it comes at the price of photo clarity. Because of the chemicals used, higher ISO films will produce much more film grain. The lower the ISO, the finer and less noticeable this grain becomes. Selecting an ISO is all about finding the balance of using an setting that is high enough to produce properly developed shots but low enough to maintain clarity and reduce noticeable grain.
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