Always look for an Authorized Tamron USA dealer. See Why -->
Some tests for you to try before you buy a lens.
Choosing Lenses for your new Hi-Res Digital SLR.
How to choose your SECOND lens.
Choosing Lenses for your Digital SLR.
35mm Equivalent focal length chart with the different cameras available.
This tool shows the correlation between depth of field and focusing distance as well as the aperture and focal length.
With this tool you can compare the focal length of various Tamron AF lenses.
