Covering three very popular short tele focal lengths when crop factor is considered 85mm, 105mm, and 135mm this lens equates to a 75-150mm constant F1.8 aperture zoom.</br>As an Art lens, the sharpness, even wide open, will rival primes while offering .</br>expected to be widely popular with both still photographers and videographers</br></br>Product Description</br></br>50-100mm F1.8 DC HSM Art is the first F1.8 telephoto zoom lens for APS-C DSLRs offering zoom convenience</br><br/>http://www.amazon.com/gp/product/B01C3SCKL8