What is Photo Exposure, Aperture, Shutter Speed, Metering & ISO?
What is photo exposure?
Photo exposure is based on the amount of light that passes through the lens, into the camera and onto the sensor. Exposure is controlled by five factors:
What is Aperture & Shutter Speed?
Aperture and shutter speed work hand in hand, with aperture measured in f-stops and shutter speed measured in seconds - or even fractions of a second. The shutter speed is key in capturing motion and movement. The aperture affects the depth of field.
What is ISO Speed?
ISO speed determines how fast the sensor of the camera reacts to light. When photographing in bright or well-lit conditions, the lowest ISO can generally be used. In low-lit conditions, the ISO must be raised to speed-up the shutter. The trade-off is noticeable noise and less detail.
What is Focal Length?
Focal length is the distance in mm from the optical center of the lens to the focal point. The longer the focal length, the closer the subject appears.
What is Metering?
Correctly metering your composition is vital to the success of the shot.
Multi-Segment Metering: The scene is split into multiple segments where light is measured. The camera then calculates the optimum exposure. A good option for point and shoot photography.
Center-Weighted Average Metering: An average reading is taken from the entire frame placing the focus on the center of the image. A good option for landscape.
Spot Metering: A reading is taken from a small area of the frame.
Blossom Prairie TM is a trademark.