Canon EF 180mm f/3.5L Macro USM EF180mm F3.5L MACRO USM Instruction Manual - Page 13

13. Extenders (Sold separately) With Extender EF1.4X ll or EF2X ll attached, the lens specifications will change as follows: Item Focal length (mm) Aperture in 1 3 stops in 1 2 stops Diagonal Angle of view Vertical Horizontal Maximum magnification (×) With EF1.4X ll Extender 252 f/5 - 45 f/4.5 - 45 9°50' 5°30' 8°10' 1.4 With EF2X ll Extender 360 f/7.1 - 64 f/6.7 - 64 6°50' 3°50' 5°40' 2.0 • First attach the Extender to the lens, then attach the lens to the camera. Detach it from the camera in the reverse order. If you attach the lens to the camera first, misoperation may occur. • With the EF1.4X II Extender attached, autofocusing is enabled from 0.8 m/2.6 ft. to infinity. Autofocus mode cannot be used to take pictures closer than 0.8 m/2.6 ft. due to the relation with the effective F value, so use manual focusing. • If you use an Extender on the lens mounted on a EOS A2/A2E/5, set the exposure compensation to -1/2 stop for the EF1.4X ll or -1 stop for the EF2X ll. • Only one Extender can be attached to the lens and camera. ENG-12