Canon EOS 50 E - Page 68

Part 2: Technical Information
3) Real-time metering for framing change detection.
The purpose is as described previously. In this case, real-time metering contin-
ues until the FE lock button is pressed.
4) When the FE lock button is pressed, "FEL" is displayed for 0.5 sec. in the
viewfinder. The focusing point for the FE lock also fl.ashes in red.
5) Ambient light metered instantaneously immediately before the prefl.ash.
Normally, the center focusing point sensor (SO) meters the ambient light. If the
focusing point is dial-selected or eye-selected with Custom Function No. 8 set to
1, the selected focusing point corresponding sensor (SO, S 1, or S2) meters the
ambient light.
6) Preflash metering
The prefl.ash reflected off the subject is metered by the same sensor used in step
5).
7) Calculation and locking of the main flash output.
While the FE lock button is on (up to 16 sec. after it is released), the flash expo-
sure value that has been calculated is locked.
During this time, the Quick Control Dial can be used for background exposure
compensation. Although the aperture setting will differ depending on the expo-
sure mode (P, Tv, M, or DEP), the camera controls the fl.ash output accordingly in
accordance with the locked fl.ash exposure value. Correct fl.ash exposure of the
subject is thereby obtained regardless.
Also, if the available flash output is deficient by 0.5 or more stops for obtaining
correct flash exposure, the lightning bolt symbol blinks (2 Hz) as an insufficient-
flash warning.
8) When the shutter button is pressed completely, the exposure sequence takes
place and the photo is taken.
FE lock (2) sequence: FE lock, shutter button pressed halfway, and shutter button
pressed completely.
■ Major operation steps executed by the EOS 50/55/Elan II:
1) Real-time metering for framing change detection.
Real-time metering is executed immediately when the FE lock button is pressed
to calculate the main fl.ash output.
2) "FEL" is displayed for 0.5 sec. in the viewfinder. The focusing point for the FE
lock also flashes in red.
3) Ambient light metered instantaneously immediately before the preflash.
Normally, the center focusing point sensor (SO) meters the ambient light. If the
focusing point is dial-selected or eye-selected with Custom Function No. 8 set to
1, the selected focusing point corresponding sensor (SO, SI, or S2) meters the
ambient light. If Eye-Controlled Autofocus is being used, the sensor (SO) for the
center focusing point meters the ambient light since no focusing point has been
eye-selected at this point.
4) Prefl.ash metering
The sensor used in step 3) is used to meter the prefl.ash reflected off the subject.
5) Calculation and locking of the main flash output.
While the FE lock button is on (up to 16 sec. after it is released). the fl.ash expo-
sure value that has been calculated is locked.
6) The EOS 50/55/Elan II meters the scene in real time according to the current
metering mode.
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