Solution
The lens will not be stopped down to the aperture you selected when another function is assigned to the depth-of-field preview button, or if it is set to [OFF]. In this case, it will not be possible to check the depth of filed by pressing the button.
Confirming the [Custom Controls] Setting
The procedure for confirming the setting is explained below.
1. Set the camera's power switch to <ON>.
2. Set the Mode Dial to < P / Tv / Av / M / B>.
3. Press the <MENU> button to display the menu screen.
4. Press the <
> button and select the [
] tab.
5. Turn the <
> dial and select the [
] tab.
6. Turn the <
> dial to select [Custom Controls], then press <
>.
7. The currently assigned function will be shown next to the button’s icon.
Assigning Depth of Field Preview in the [Custom Controls] Menu
When another function is assigned to the depth-of-field preview button, or if it is set to [OFF], please refer to the procedure explained below.
1. Turn the <
> dial to select [depth-of-field preview button], then press <
>.
2. Turn the <
> dial to select [depth-of-field preview ], then press <
>.
NOTE
You can press the <
> button to revert the Custom Control settings to their defaults.
Note that the [
: Custom Controls] settings will not be canceled even if you select [
: Clear all Custom Func. (C.Fn)].
3. Press the depth-of-field preview button to check the depth of field.
You can press the depth-of-field preview button to stop down the lens to the current aperture setting and check the depth of field (range of acceptable focus).
NOTE
- If the settings cannot be returned to normal by following the procedure above, please contact a Canon Customer Service Center.
- A higher f/number will make more of the foreground and background fall within acceptable focus. However, the viewfinder will look darker.
- While looking at the Live View image, you can change the aperture and press the depth-of-field preview button to see how the depth of field changes.
- The exposure will be locked (AE lock) while the depth-of-field preview button is pressed.
REFERENCE
For more information on assigning custom control functions, please refer to the links in the related information section below.
