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Film - Digital

How does focal length affect the close focus distance of a lens?

Like all lenses, longer focal length lenses  have the ability to focus to infinity, but as the focal length increases the closest focusing distance decreases dramatically. The chart below gives an approximation of these distances.
Focal length of lens
Standard closest focusing distance
20mm wide angle
 6 inches - 0.15m
28mm wide angle
1 ft   - 0.3m
(standard lens on 35mm camera)
 2ft - 0.6 m
small telephoto
5ft - 1.5m
25ft -  8 m
33ft  -10m

What is a macro lens?

What is a Zoom lens?

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