User's Manual

The Other YN-622C User Guide
14/09/2012 Page 10 of 18
E-TTL MODE
Automatic Adjustable Metering
Type A cameras
Camera menus or buttons
• All (global), A:B (ratio), A:B C (ratio + FEC)
• FEC +/- 2 stops, with on-flash FEC settings adding to the result.
• E-TTL modes Evaluative or Average
• E-TTL Flashes emit a pre-flash
Type B cameras
Camera buttons
• All (global), no Canon ratio.
• FEC +/- 2 stops, with additive on-flash FEC setting
• E-TTL modes Evaluative or Average
• E-TTL Flashes emit a pre-flash
Ratio
Canon’s lighting ratio becomes available through the Firing Group settings, when Wireless mode is
enabled. This is the true professional multi-preflash “effective reflected light” ratio, not an
approximation.
• Ensure that the light output requirements are within the capability of the flashes, possibly by
increasing ISO, changing distance to subject, etc.
• Flashes with different maximum outputs can be mixed.
A:B Firing Group
• Set the lighting ratio from 8:1 to 1:8 (in 1/2-stop increments)
• A “normal” subject exposure will be calculated.
• This total exposure can be adjusted by the over-all FEC setting.
• The effective reflected light from group A flashes (including on-top flash) and group B
flashes will be evaluated by the camera and transmitted to the flashes by the 622.
• Group C does not fire.
A:B C Firing Group
• Set A:B ratio as above.
• Set an FEC (-, 0 or +) for flashes in Group C.
Flash Exposure Lock (FEL)
• Canon FEL is implemented.
Flash Exposure Compensation (FEC)
The over-all flash exposure can be adjusted using the camera button, camera flash control menu,
and the on-flash setting.
• FEC can be set in 1/3-stop increments within 2 or 3, depending on camera.
• The total compensation is the flash FEC setting plus the camera menu setting. For
example, if the camera menu is set to -2, and the flash is set to +1, then exposure
compensation will be -1.