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
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 onlyMagnification |
| 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 |
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| +½ |
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| +1.0 |
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(stops) | in ¹ä³ stops |
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| 0 |
| +²ä³ | +1.0 | +1¹ä³ | ||
EF50mm f/2.5 with Life Size Converter EF |
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Magnification |
| 1:4 | 1:2 |
| 1:1.5 | 1:1.2 | 1:1 |
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Effective f/No. |
| 1.64 | 1.87 | 2.16 | 2.49 | 2.86 |
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Exposure Factor | in ½ stops | +½ | +1.0 | +1½ |
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(stops) | in ¹ä³ stops | +²ä³ | +1.0 | +1¹ä³ | +1²ä³ |
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EF100mm f/2.8 Macro |
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Magnification |
| 1:4 | 1:3 |
| 1:2.5 | 1:2 | 1:1.5 | 1:1 |
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Effective f/No. |
| 1.44 | 1.61 | 1.76 | 1.99 | 2.41 | 3.38 |
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Exposure Factor | in ½ stops | +½ |
| +1.0 | +1½ | +2.0 |
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(stops) | in ¹ä³ stops | +¹ä³ | +²ä³ |
| +1.0 | +1¹ä³ | +1²ä³ |
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•The correct exposure for a
•When taking
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
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 | |
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Angle of View |
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| 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 | |
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| 0.57 to ∞ m (1.45 to ∞ | |
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| inch) with limit | |
Max. Magnification | 0.5×/1× (with Life Size |
| 1× | |
Converter EF attached) | ||||
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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) |
QThe lens length is measured from the mount surface to the front end of the lens. Add 21.5 mm when including the lens cap and dust cap.
QThe size and weight listed are for the lens only, except as indicated.QAperture settings are specified on the camera.QAll data listed is measured according to Canon standards.QProduct specifications and appearance are subject to change without notice.QCase and hood not provided with some models.QFilters 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●❺ | ●❼ |
3 | 5 | 10 | f t | |
0.8 1 | 1.5 | 3 |
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32 16 |
| 16 | 32 |
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❻● - Ⓐ●
3 | 5 | 10 | f t | |
0.8 1 | 1.5 | 3 |
| m |
32 16 |
| 16 | 32 |
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●❻ - ●Ⓑ
3 | 5 | 10 | f t |
0.8 1 | 1.5 | 3 | m |
32 16 | 16 | 32 |
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| © CANON INC. 1990 | 2008.5 |