Tamron SP 70-210mm F/3.5 is a continuous focusing (CF) tele-macro super zoom lens. The above average performing lens has one-touch constant f/3.5 aperture zoom with revers zooming cam (the zoom collar moves forward to become a lens shade when zooming to the longer focal lengths). Macro optical performance reaches 1:2.66 life size at the 210mm position. Macro performance towards the corners of the field is superior to its predecessors. Optical performance is achieved throughout the entire zoom and focusing range. Overall, the lens has a solid construction, ease of handling, zero zoom creep, and optimized variable shading when used with lens hood.