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Langford's Basic Photography, 9th Edition by Richard Sawdon Smith, Anna Fox, Michael Langford

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Whether you are using an SLR or view camera with interchangeable lenses, or a compact with a permanently attached zoom, you will soon want to explore the use of different focal lengths. Almost all camera types can be fitted with accessories – from tripods and other supports to flashguns and camera bags – many of which are worth considering as useful practical kit for your kind of photography.

Why change focal length?

Lenses of fixed focal length (i.e. not zoom), regarded as standard for cameras reviewed in the last chapter, are typically 50 mm for 35 mm, 28 mm for digital SLR, 100 mm for 60 × 70 mm format and 150 mm for 5 × 4 inch As Figure 3.4 ...

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