Canon MP-E 65mm f/2.8 1-5X Manuel Du Propriétaire
ENG-7
3. Setting the Exposure
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.
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.
Use the following formula to calculate the
effective f-number:
effective f-number:
Effective f-number = f-number
× (Magnification + 1)
For example, if the aperture displayed by the
camera is f/2.8 and the magnification is 1
camera is f/2.8 and the magnification is 1
×, the
effective f-number will be f/5.6.
Setting the Exposure
The correct exposure for a close-up shot largely
depends on the subject. Therefore, try to bracket
the exposure for the same subject.
depends on the subject. Therefore, try to bracket
the exposure for the same subject.
With the EOS-1Ds Mark III, 1Ds Mark II, 1Ds, 1D Mark III,
1D Mark II N, 1D Mark II, 1D, 1, 1N/DP/HS, and 1V/HS
TTL autoexposure metering is possible from 1
1D Mark II N, 1D Mark II, 1D, 1, 1N/DP/HS, and 1V/HS
TTL autoexposure metering is possible from 1
×
to 5
×. Select the desired picture-taking mode and
check the shutter speed and aperture.
With Other EOS Cameras
Since there will be a slight exposure error, using AE
metering is not recommended. Take test shots first
or use a handheld meter to determine the proper
exposure based on the effective f-number. If you use
the f-number displayed by the camera, use the
exposure factor in the table below to convert it.
Since there will be a slight exposure error, using AE
metering is not recommended. Take test shots first
or use a handheld meter to determine the proper
exposure based on the effective f-number. If you use
the f-number displayed by the camera, use the
exposure factor in the table below to convert it.
Magnification
1
×
2
×
3
×
4
×
5
×
Exposure Factor
+2
+3
+4
+4
+5
(stops)*
+2
+3
+4
+4
+5
1
2
2
1
3
3
2
3
3
1
3
3
*
Upper values: 1/3 stops. Lower values: 1/2 stops.
Magnification
1
×
2
×
3
×
4
×
5
×
Effective f/No.
5.6
8.4
11.2
14.0
16.8