The Tamron 70-210mm F4 Di VC USD is a lightweight telephoto zoom lens for DSLR Key specifications 70-210mm focal range becomes equivalent to 105-315mm on Nikon APS-C, 112-336mm on Canon APS-C 4 stops image stabilization (CIPA rated) 0.32x maximum magnification, 0.95m (37.4") minimum focus distance Ultrasonic Silent Drive 'silent' focus motor (still audible in video capture if you use your camera's internal mic) Fluorine coating on the front element combats fingerprints Weather-sealed, internal zoom and focus 67mm filter thread, weighs 859g (1.89lb) This segment of lenses is an important step-up for photographers who want more speed than 55-200mm or 55-250mm kit telezooms, which often only offer F5.6 or F6.3 at the telephoto end, but without going all-in with the heft and expense of constant F2.8 variants. Unique to The Tamron is an extra 10mm of reach on the long end than its competitors (which makes for a nice, neat 3x zoom factor), but the difference between 210 and 200mm is negligible in real-world shooting.