Canon 7D: AE Lock
There are 2 uses for the Auto-Exposure AE lock:
- When you want to have the area of focus to be different from the area metered for the exposure.
- When you want to take multiple photos with the same exposure setting irrespective of the change in framing or light.
Press the <*> button to lock the exposure, then you can recompose and take the photo.The AE Lock locks the exposure for 4 seconds.
What gets measured will depend on the metering mode:
| Metering Mode | Point Used |
|---|---|
| Partial | Center point |
| Spot | Center point |
| Average | Center point |
| Evaluative & AF point selected by camera | AF point that has achieved focus |
| Evaluative & Manual selection of AF point | AF point selected even if it didn’t achieve focus |