Aperture, Shutter Speed and Depth of Field
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The document introduces aperture, depth of field, and shutter speed as they relate to photography. It explains that aperture is the size of the lens opening and controls the amount of light entering the camera. A larger aperture admits more light and results in a shallower depth of field where only the subject is in focus. A smaller aperture admits less light and produces a larger depth of field where the subject and surrounding areas are in focus. Shutter speed determines how long the camera sensor is exposed to light and must be adjusted based on lighting conditions to avoid under or overexposure. Aperture, depth of field, and shutter speed all interact to control the exposure of the photo.
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Aperture, Shutter Speed and Depth of Field
- 1. PHOTOGRAPHY Introduction to: Aperture, Depth of Field & Shutter Speed
- 2. WHAT IS APERTURE? • The aperture is the size of the lens opening • It controls the amount of light that is let in: • A larger aperture lets in more light • A smaller aperture lets in less light
- 3. APERTURE • The smaller the f/number, the larger the opening • The larger the f/number, the smaller the opening f = Sign for aperture The F word!
- 4. IMPORTANCE OF APERTURE How can it change what your picture looks like? A larger aperture (lower f/number) will have your subject in focus, and everything in front of and behind it blurry. A smaller aperture (higher f/number) will have your subject in focus and everything in front of and behind it quite focused as well. Also known as Depth of Field
- 5. DEPTH OF FIELD Large aperture = Shallow depth of Field Small aperture = Large depth of Field • Large depth of field = much of the image is sharp and in focus. • Shallow depth of field = only a small part of the image is sharp and in focus. There are three things which can change the depth of field: 1. The aperture 2. The focal length of the lens used 3. How near the subject focussed on is to the camera
- 6. SHUTTER SPEED • It's how long the sensor/film in the camera is exposed to light • Shutter Speeds: ½ ¼ 1/8 1/15 1/30 1/60 1/125 • This depends on how much light there is • If the shutter is open too long, the picture will be too bright, and if it's not open long enough, the scene will be too dark Also known as Exposure
- 7. EXPOSURE Exposure = Total amount of light which hits the film This is controlled by both the aperture & shutter speed
- 8. REVIEW What have we learnt? • Aperture use = f sign • Depth of field = focus of the image • Use of shutter speed = fractions • Exposure = total amount of light They all connect!