About: http://webisa.webdatacommons.org/200927885

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	There is a lot of weight up front and it can become awkward to use especially for car racing where panning is involved.The f2.8 versions are heavy.According to one review, the f4 IS is the sharpest of the four lenses.
http://www.w3.org/ns/prov#wasQuotedFrom	betterphoto.com