At 16mm, the Canon EF 16-35mm f/2.8L USM Lens is very sharp in the center even wide open (f/2.8) and improves little when stopped down. The 16mm full-frame corners are soft wide open (with a flat target - because of field curvature) and improve noticeably at f/5.6. At 16mm with a close subject distance, strong barrel distortion is noticeable Canon EF 16-35mm f/2.8L III USM là chiếc ống kính zoom góc siêu rộng đời thứ 3, cũng là đời mới nhất trong dòng tiêu cự 16-35mm của Canon cho đến bây giờ. Đây là chiếc ống kính dòng L chỉ đỏ, được Canon định hướng dành riêng cho những người sử dụng… EF16-35mm F2.8L USM. EF17-35mm F2.8L USM（1995年発売）の後継機種として開発。. 従来機種を上回る高画質を実現するとともに、広角側の焦点距離を16mmに広角化することで、35mmフィルムカメラに比べイメージサイズの小さいデジタルAF一眼レフカメラでも超広角撮影が EF 16-35mm f/2.8L III USM專業大光圈全片幅超廣角變焦鏡頭融匯佳能各項超卓光學技術，其銳利細緻的高解像力能滿足新一代EOS全片幅相機的超高像素拍攝需要。. 鏡頭的16mm超廣角端帶來高達108°超廣視角，輕易攝獵一望無際的大自然風光或宏偉的城市景觀，影像效果 . The EF 70–200mm f/2.8L IS III USM lens features an incredibly bright zoom with an f/2.8 maximum aperture that stays constant throughout the zoom range. The EF 70–200mm f/2.8L IS III USM's bright image even enhances AF performance, sending more light to more areas of the AF sensor to help facilitate a faster, more accurate focus. The Canon EF 16-35mm f/2.8L II USM Lens is what I consider one of the most important lenses in Canon's lineup. Taking over the ultra-wide angle position of the available professional grade f/2.8 zoom lenses from the Canon EF 16-35mm f/2.8L USM Lens, the 16-35 L II becomes the new standard for professional and serious amateur photographers alike. The Canon 17-40mm f/4 L (2003-today) is Canon's lightest current ultrawide zoom, and has optical performance as good as the newest Canon 16-35mm L II, but it's only f/4, not f/2.8. 17-35mm f/2.8 L (1995-2001) The Canon 17-35mm f/2.8 L (1995-2001) is Canon's lightest f/2.8 ultrawide zoom ever, has a metal filter thread and great ergonomics with Verdict. The third in its series, the Canon EF 16-35mm f/2.8L USM III joins the latest EF 24-70mm and EF 70-200mm f/2.8 zooms, as the wide-angle lens in the ‘trinity’ collection. As such, it’s not as ultra-wide as the EF 11-24mm f/4L USM zoom, but is an f/stop faster. The maximum viewing angle is slightly less than from the competing At 16mm, the Canon EF 16-35mm f/2.8L USM Lens is very sharp in the center even wide open (f/2.8) and improves little when stopped down. The 16mm full-frame corners are soft wide open (with a flat target - because of field curvature) and improve noticeably at f/5.6. At 16mm with a close subject distance, strong barrel distortion is noticeable

canon ef 16 35 f2 8 l iii usm