|
STM Lenses
"STM" stands for stepping motor. This motor is synchronized and operated by pulse electricity which facilitates quick response time during start-up and power-down, and a high level of controllability. Structural simplicity promotes smooth and silent operation while allowing for a compact design.
For more information on lenses equipped with STM, please refer to the Canon homepage or the lens instruction manual.
Handling precautions
1. The motor does not operate while the camera is OFF or when the camera is OFF due to the use of the auto power off function. Therefore, users must be aware of the following points.
- Manual focus adjustments are not possible.
- For zoom lenses, delayed focus will occur during zooming.
2. If not operated for a certain period of time, the lens will enter sleep mode in order to save power. Sleep mode differs from when the camera is OFF due to the use of the auto power off function. To exit sleep mode, press the shutter button halfway.
In this state, the motor will not operate even if the camera is ON. Therefore, users must be aware of the following points.
- Manual focus adjustments are not possible.
- For zoom lenses, delayed focus will occur during zooming.
3. For zoom lenses, when the camera is ON or when the camera is turned ON by pressing the shutter button halfway down when the camera is OFF due to the use of the auto power off function(*1), the lens performs an initial reset of the focus lens.
- Although the image in the viewfinder will appear out of focus during the initial reset, this does not mean that the lens has malfunctioned.
- Although the shutter can be released during the initial reset, users must wait approximately 1 second (*2) after the initial reset has completed before shooting.
*1: For more information on lenses equipped with this feature, please refer to the STM lens instruction manual.
*2: The initial reset time varies depending on camera being used.
|
