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EF-S 17-55mm f/2.8 IS USM - Focal Length Confusion

Started Oct 10, 2012 | Discussions thread
Peter Kwok
Peter Kwok Senior Member • Posts: 2,635
Your T4i is not a P&S
1

P&S cameras are marketed with equivalent focal length of their zoom lens.  It is a convenient way to compare with other brands.  For example, the S100 is said to have a 24-120mm zoom.  If any one actually look at the lens, it says 5.2-26mm.  But nobody cares.

1.6 crop bodies are meant to use both EF-s and EF lens.  It is easier to say your lens is 17-55mm, not because Canon think their customers are smart to do the math conversion to 27-88, but because it is easier to compare with other full frame lens.  You can know that a 50mm lens is about the same as the 17-55 zoom all the way in and a 85mm lens is a bit longer than this zoom.  If the 17-55 is marketed as a 27-88, people may think the 85mm has less reach.

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Peter Kwok
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