ISO
The lens aperture, shutter speed, and ISO are all parts of the exposure triangle.
As you change from one ISO to the next, the exposure doubles.
As you increase the ISO, the light values captured by the camera are increased as well. Because of this, any background "noise" in the picture is amplified, resulting in a grainy picture.
In order to reduce the grain in high ISO pictures, you can shoot your pictures using a High ISO Noise Reduction setting on your camera, or use programs like Photoshop to edit your pictures.
Chromatic noise appears as multicolored blotches across the photograph. Luminance noise appears as scattered black dots across the photograph.
Increasing the ISO would be useful in situations where you're taking a picture at night but don't have a tripod or need to hold your camera. It would also be useful in photographing sports, when a short shutter speed would be necessary.
As you change from one ISO to the next, the exposure doubles.
As you increase the ISO, the light values captured by the camera are increased as well. Because of this, any background "noise" in the picture is amplified, resulting in a grainy picture.
In order to reduce the grain in high ISO pictures, you can shoot your pictures using a High ISO Noise Reduction setting on your camera, or use programs like Photoshop to edit your pictures.
Chromatic noise appears as multicolored blotches across the photograph. Luminance noise appears as scattered black dots across the photograph.
Increasing the ISO would be useful in situations where you're taking a picture at night but don't have a tripod or need to hold your camera. It would also be useful in photographing sports, when a short shutter speed would be necessary.
ISO put into practice
Full sun - shallow depth of field
ISO 100
F-stop 5.6
Shutter Speed 1/800
The ISO is set to 100 because the sunlight outside provides plenty of light, and the shutter speed is short because there doesn't need to be any long exposure to capture lots of light.
ISO 100
F-stop 5.6
Shutter Speed 1/800
The ISO is set to 100 because the sunlight outside provides plenty of light, and the shutter speed is short because there doesn't need to be any long exposure to capture lots of light.
Shade - Fast shutter speed
ISO 400
F-stop 4
Shutter speed 1/800
The ISO was set to 400 because of the shade, and the F-stop was set to 4 to allow more light in.
ISO 400
F-stop 4
Shutter speed 1/800
The ISO was set to 400 because of the shade, and the F-stop was set to 4 to allow more light in.
Inside - Fast shutter speed
ISO 1600
F-stop 4
Shutter speed 1/100
The ISO was set to 1600 to brighten up the image, otherwise the picture would've been too dark. The F-stop was set to 4 to allow more light into the camera.
ISO 1600
F-stop 4
Shutter speed 1/100
The ISO was set to 1600 to brighten up the image, otherwise the picture would've been too dark. The F-stop was set to 4 to allow more light into the camera.