Canon EF100mm f/2 USM 지침 - 페이지 8

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6. About Exposure

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 picture-

taking. However, for closeup photography, you

cannot ignore the change in the effective f-

number.

When you use a handheld exposure meter to set

the exposure, you must take into account the

exposure factor shown in the following table.

Magnification

1 : 5

Effective f/No.

3.6

Exposure Factor

(stops)*

Upper values: 1/3 stops. Lower values: 1/2 stops.

• The correct exposure for a close-up shot largely

depends on the subject. Therefore, try to bracket

the exposure for the same subject.

• Using aperture-priority AE (Av) or Manual (M)

picture-taking modes are recommended for

macro photography as it is easy to adjust depth

of field and exposure in these modes.

If your eye will not be covering the eyepiece when

the picture is taken (with remote control operation,

etc.), use the eyepiece shutter or eyepiece cover.

This prevents stray light from entering the

eyepiece and throwing off the proper exposure.

1 : 3

1 : 2 1 : 1.5 1 : 1

4.1

4.6

5.0

5.9

ENG-7