Lenses that support changes in the AF speed Extender 1.4x EF-S 10-18mm f /4.5- 5.6 IS STM EF-S 15-85 mm f/3.5-5.6L IS USM EF-S 18-55mm f/3.5-5.6 IS STM EF-S 18-135mm f/3.5-5.6 IS STM EF-S 55-250mm f/4-5.6
... is smaller than f / 5.6 (larger f /stop number than f / 5.6 ). EF14 mm F 2.8 L USM EF24 mm F 1.4 L USM EF100 mm F 2.8 ... EF400 mm F 2.8 L USM * EF500 mm F 4.5 L USM EF600 mm F 4 L USM EF1200 mm F 5.6 L USM ... 16-35 mm F 2.8 L USM
Telephoto Lens DEFINITION: Lenses between 80 mm and 300mm are considered telephoto lens. An 80mm lens is considered a shot telephoto and a 300mm lens is considered a long telephoto lens.
Specifications for the EF 17-40 f/4L USM The EF17-40mm f /4 L USM was developed as high-end version of the highly acclaimed EF20-35mm f / 3.5 -4.5 USM lens released in March 1993. Designed for use by professional and amateur users alike, this lens realizes the outstanding image resolution that distinguishes an L-series lens while retaining high cost performance.
Specifications for the EF20-35mm f/3.5-4.5 USM Marketed March 1993 Lens Construction (group) 11 Lens Construction (element) 12 No. of Diaphragm Blades 5 Minimum Aperture 22-27 Closest Focusing Distance (m) 0.34 Maximum Magnifcation (x) 0.13 Filter Diameter ( mm ) 77 Maximum Diameter x Length ( mm ) 83.5 x 68.9 Weight (g) 340
