The tamron SP 90mm f/2.8 Di VC USD Macro, EF Fit (F017) is a short telephoto
prime designed for full-frame canon EF-mount DSLRs. Offering a life-size
maximum magnification ratio of 1:1, this lens benefits working with small and
nearby subjects and employs a Floating System for maintained image quality
throughout the 11.8" to infinity focusing range. One Low Dispersion and two
Extra Low Dispersion glass elements are incorporated into the optical design to
minimize chromatic aberrations and color fringing for clean, consistent
sharpness and clarity throughout the magnification range. BBAR and eBAND
coatings have also been applied to minimize flare and ghosting for increased
contrast when working in strong lighting conditions, and a rounded nine-blade
diaphragm contributes to a pleasing bokeh quality to benefit shallow depth of
field imagery. As an update to the classic 90mm macro, this enhanced version is
well-suited to the high-resolution crop of DSLRs and blends timeless appeal and
functionality with current imaging performance.