Canon T3i User Manual download pdf (Page 11)

Canon T3i Experience

want the face or the subject to be properly exposed and not risk blowing the shot, it is

worth it to use Partial Metering mode. Another time to use this is when there is a wide

range of light in your scene, from bright sunlight to deep shadows. You will need to

determine and lock the exposure settings of a critical area of the scene - a face or a

middle tone in the area you want properly exposed (see Figure 15). Remember, this

mode is not linked to your focus point. The partial area that is metered is always in the

center, so meter on a face or middle tone in the part of the scene that is most critical

and that you want properly exposed, using the central area of the viewfinder. Lock in

that exposure using Exposure Lock (explained below), then focus, recompose and

take the shot.

Figure 15 - Lion Sculpture in Museum - Partial Metering used to properly expose for the

subject, then focus and exposure locked, and framing recomposed to place subject off

center. (Very carefully hand-held at very slow shutter speed.) Shutter speed 1/13,

aperture f/4.0, ISO 800

3.6c Spot Metering

This mode meters a smaller center area, approximately 4% of the viewfinder area. This

area is indicated by the small circle in the center of the viewfinder (see Figure 14). So

when do you want to use Spot metering? This, again, is useful for scenes with great

variation in light and shadow, or in very critical situations. It is used like Partial

Metering, but when the critical area that you are metering is even smaller and more

precise. One of the most common ways to use it is when metering for proper exposure

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Canon T3i User Manual Page 11