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 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