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cogitech
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Re: Tamron 18-270 vs. Canon 70-300


The \"zoom factor\" is calculated like this:

270/18=15x

300/70=4.3x

So, the 70-300 is \"only\" a 4.3x zoom, but this tells you nothing about the actual reach of the lens.

The 300mm end of the 70-300 still gives you more \"zoom\" (reach) than the 270mm end of the 18-270.

It is likely best to abandon the term \"zoom factor\" altogether and learn about focal length.


Nov 21, 2008 at 10:41 AM





  Previous versions of cogitech's message #6405142 « Tamron 18-270 vs. Canon 70-300 »