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
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
Infinity Distance Mark To compensate for shifting of the infinity focus point that results from changes in temperature. The infinity position at normal temperature is the point at which the vertical line of the L make is aligned with the distance indicator on the distance scale.
