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occurred Apr 30, 2021 at 12:00

adding "zoom" to the tags so this can be found more easily; obviously that's a tag that covers the answers more than the question

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edited Nov 21, 2011 at 15:31

mattdm

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What does How can a lens like a 18-55 mm mean55mm have more than one focal length?

How can a lens have a range of focal lengths (shouldn't? Shouldn't it be a single number instead of a range)?

Isn't focal length supposed to be fixed for a lens of a particular shape and geometry?

What am I missing?

How many lenses are actually there in a "lens"?

Tempted to tag "zoom" but that's the answer, not the question.

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edited May 4, 2011 at 17:37

mattdm

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lens camera-basics focal-length lens-design optics

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edited Aug 8, 2010 at 21:25

chills42

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lens beginner camera-basics focal-length

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edited Aug 8, 2010 at 20:16

jrista

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edited Jul 18, 2010 at 12:06

Josh Goldshlag

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added 51 characters in body; added 4 characters in body

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edited Jul 18, 2010 at 6:14

Lazer

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asked Jul 18, 2010 at 5:59

Lazer

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What does How can a lens like a 18-55 mm mean55mm have more than one focal length?

What does 18-55 mm mean?

How can a lens like a 18-55mm have more than one focal length?