Canon RF 35mm F1.8 Macro IS STM RF35mm F1.8 MACRO IS STM Instructions - Page 13

6. Exposure When Taking Close-up (Macro) Shots Setting the Exposure When taking photographs using TTL metering, no exposure compensation is necessary because the light coming through the lens is measured. With TTL metering, photographing with AE (auto exposure) is possible at all focusing distances. Just select the desired picture-taking mode, then check the shutter speed and aperture before taking a picture. Magnification and Effective f-number The aperture displayed on 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 has almost no influence on the exposure for normal picture taking. However, for close-up (macro) shooting, the change in the effective f-number is more than negligible. When deciding the exposure using a hand-held exposure meter, apply the following exposure factor. Magnification Focusing distance (m/ft.) Effective f/No. Exposure factor (stops)* 1:5 1:3 1:2 0.27/0.89 0.20/0.66 0.17/0.56 2.1 2.2 2.4 +1/3 +2/3 +1 +1/2 +1/2 +1 * Upper values: 1/3 stops. Lower values: 1/2 stops. zzConditions of the subject are very important when deciding on the correct level of exposure for close-up (macro) shooting. It is therefore recommended that you change the exposure level as much as possible during shooting, or that you take pictures while checking the images on the camera's LCD monitor. zzDuring close-up (macro) shooting, it is recommended that you use either the aperturepriority AE (Av) mode or manual exposure (M) mode, in which adjustment of the depth of field and exposure is easier. ENG-12