Lenses that support changes in the AF speed USM EF 400mm f /4 DO IS II USM EF 11- 24 mm f /4L USM EF 50mm f /1.8 STM EF 35 mm f /1.4L II USM EF-S 18-135mm f/3.5-5.6 IS USM EF 24-105mm f /4L IS II USM EF 70-300 mm f/4-5.6
Specifications for the EF 180 f/3.5L Macro USM Marketed April 1996 Lens Construction (group) 12 Lens Construction (element) 14 No. of Diaphragm Blades 8 Minimum Aperture 32 Closest Focusing Distance (m) 0.48 Maximum Magnifcation (x) 1.0 Filter Diameter ( mm ) 72 Maximum Diameter x Length ( mm ) 82.5 x 186.6 Weight (g) 1,090
Effect f-number = f-number x (magnification /1) For example, if the aperture displayed by the camera is f /2.8 and the magnification is 1x, the effective f -number will be f / 5.6 (see chart below) Setting the Exposure