5. 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.

When you use a handheld exposure meter to set the exposure, you must take into account the exposure factor shown in the following table.

EF50mm f/2.5 Compact macro lens only

Magnification

 

1:10

1:8

 

1:6

1:5

1:4

1:3

1:2.5

1:2

Effective f/No.

 

1.21

1.27

1.36

1.44

1.56

1.78

1.96

2.25

Exposure Factor

in ½ stops

0

 

 

 

+½

 

 

+1.0

 

(stops)

in ¹�³ stops

 

 

0

 

+²�³

+1.0

+1¹�³

EF50mm f/2.5 with Life Size Converter EF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Magnification

 

1:4

1:2

 

1:1.5

1:1.2

1:1

 

 

 

Effective f/No.

 

1.64

1.87

2.16

2.49

2.86

 

 

 

Exposure Factor

in ½ stops

+½

+1.0

+1½

 

 

 

(stops)

in ¹�³ stops

+²�³

+1.0

+1¹�³

+1²�³

 

 

 

 

 

 

 

 

 

 

 

 

 

EF100mm f/2.8 Macro

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Magnification

 

1:4

1:3

 

1:2.5

1:2

1:1.5

1:1

 

 

Effective f/No.

 

1.44

1.61

1.76

1.99

2.41

3.38

 

 

Exposure Factor

in ½ stops

+½

 

+1.0

+1½

+2.0

 

 

(stops)

in ¹�³ stops

+¹�³

+²�³

 

+1.0

+1¹�³

+1²�³

 

 

•The correct exposure for a close-up shot largely depends on the subject. Therefore, it is recommended to take several shots of the same subject at different exposures.

•When taking close-up shots, it is recommended to use aperture- priority AE (Av) or Manual (M) picture-taking modes, because depth of field and exposure are easy to adjust in those modes.

6. Depth-of-Field Scale

The depth of field is the distance in front of and behind the plane of focus on the subject that appears sharp. The depth of field is indicated by the area between the depth-of-field scale lines below the distance scale. The numbers on the scale are F values (with the EF50mm f/2.5 Compact macro ❺ ).

• The depth-of-field scale is an approximate indicator.

7. Infrared Index (EF50mm f/2.5 Compact macro only)

The infrared index corrects the focus setting when using monochrome infrared film. Focus on the subject in MF, then adjust the distance setting by moving the focusing ring to the corresponding infrared index mark ❻ - Ⓐ , Ⓑ .

•Some EOS cameras cannot use infrared film. See the instructions for your EOS camera.

8. Filters

You can attach filters to the filter mounting thread on the front of the lens ❼ .•Only one filter may be attached.•Use a polarizing Canon filter (52 mm).

9. Specifications

 

EF50mm f/2.5

 

EF100mm f/2.8

Focal Length/Aperture

50mm, f/2.5

 

100mm, f/2.8

Lens Construction

8 groups, 9 elements

 

9 groups, 10 elements

 

Diagonal–46°

 

Diagonal–24°

Angle of View

Vertical–27°

 

Vertical–14°

 

Horizontal–40°

 

Horizontal–20°

 

 

 

0.31 to ∞ m full (0.79 to

Focusing Distance

0.23 to ∞ m

 

∞ inch)

 

0.31 to 0.57 m (0.8 to

Ranges

(0.58 to ∞ inch)

 

0.14 inch) with limit

 

 

 

0.57 to ∞ m (1.45 to ∞

 

 

 

inch) with limit

Max. Magnification

0.5×/1× (with Life Size

 

1×

Converter EF attached)

 

 

Filter Diameter

 

52 mm

Max. Diameter and

67.6 × 63 mm

 

75 × 105.3 mm

Length

(2.7 × 2.5 inch)

 

(3 × 4.1 inch)

Weight

280 g (9.8 oz)

 

650 g (1.42 lb)

nThe lens length is measured from the mount surface to the front end of the lens. Add 21.5 mm to include the E-52 lens cap and dust cap, and 23.9 mm for the E-52 II.

nThe size and weight listed are for the lens only, except as indicated.nAperture settings are specified on the camera.nAll data listed is measured according to Canon standards.nProduct specifications and appearance are subject to change without notice.nCase and hood not provided with some models.nFilters sold separately.

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Do not make any changes or modifications to the equipment unless otherwise specified in the instructions. If such changes or modifications should be made, you could be required to stop operation of the equipment.

This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of the FCC Rules.

These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.

However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

•Reorient or relocate the receiving antenna.•Increase the separation between the equipment and receiver.•Consult the dealer or an experienced radio/TV technician for help.This Class B digital apparatus complies with Canadian ICES-003.

●❺

●❼

3

1

5

10

ft

0.8

1.5

3

 

m

32 16

 

16

32

 

❻● - Ⓐ●

3

1

5

10

ft

0.8

1.5

3

 

m

32 16

 

16

32

 

●❻ - ●Ⓑ

3

1

5

10

ft

0.8

1.5

3

m

32 16

16

32

 

CT1-8537-003

1208SZ

© CANON INC. 2006