Unit 57 Photography Lenses Lenses of different focal
- Slides: 15
Unit 57 – Photography Lenses
Lenses of different focal lengths allow photographers to have more creative control 1. 2. 3. 4. Standard lens Wide-angle lens Telephoto lens Macro lens Why do we use different lenses?
The standard lens produces image with a perspective close to the human eye. On a 35 mm camera the standard lens has a focal length of 50 mm.
On digital cameras the sensor is often smaller than the 35 mm frame. This means that the focal length of a lens is effectively 1. 5 x longer. So a 50 mm lens on a digital camera is effectively a 75 mm lens. A 35 mm lens on a digital camera is effectively a 50 mm lens.
Wide-angle lenses have: 1. A wider field of view – they show more 2. A bigger depth of field for any given aperture 3. A greater sense of space – they extend perspective Wide-angle lenses are typically used for landscape and architectural photography and have a focal length less than 50 mm
Telephoto lenses have: 1. A smaller field of view – they magnify the image 2. A small depth of field for any given aperture 3. A smaller sense of space – they compress perspective Telephoto lenses are typically used for wildlife and sports photography and have a focal length greater than 50 mm
21 mm wide-angle lens 50 mm standard lens 80 mm telephoto lens 200 mm telephoto lens
Macro lenses have an ability to focus much closer to the subject than normal lenses. Attachments such as extension tubes and bellows fit between the camera and lens and allow normal lenses to be used for close-up photography
Macro lenses come in a range of focal lengths but all have the ability to focus much closer than normal lenses
Filters can be used on lenses to enhance or change the image. Neutral density filters act like sunglasses to cut down the amount of light reaching the film or sensor. They come in a range of strengths.
Yellow, orange and red filters can be used with black and white film to make blue skies appear darker
21 mm 80 mm 50 mm 35 mm 200 mm
21 mm 50 mm 200 mm
Wide-angle lens Telephoto lens
Task for today: In your groups each person must take a series of pictures that show the properties of: • Wide-angle lenses • Standard lenses • Telephoto lenses
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