Canon EF-M 28mm f/3.5 Macro IS STM User Manual - Page 14

6 Exposure When Taking Close-up (Macro) Shots Setting the Exposure When taking photographs using TTL metering, no exposure compensation is necessary to meter the light coming through the lens. With TTL metering, AE (autoexposure) is possible at all focusing distances. Just set the desired picture-taking mode, then check the shutter speed and aperture before taking the picture. Magnification and Effective f-number The aperture displayed by the camera assumes that the focus is set to infinity. The actual aperture (effective f-number) becomes darker (effective f-number increases) at closer focusing distances (magnification increases). This does not cause exposure problems for normal picturetaking. However, for closeup photography, you cannot ignore the change in the effective f-number. ●● Conditions prevalent with the subject are very important when deciding on the correct level of exposure for close-up (macro) shots. It is therefore recommended that exposure levels are amended as much as possible during shooting, or that the image of the subject is checked on the camera's LCD monitor. ●● Using either the aperture-priority AE (Av) mode or manual exposure (M) mode is recommended for close-up (macro) photography, as these make it easier to adjust the depth of field and exposure. ENG-13