The Other YN-622C User Guide v.4.09
11/12/2014
Part II – 622C Transceivers Page 27 of 64
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 f/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 f/stops, with on-flash FEC adding to the result.
• E-TTL modes Evaluative or Average.
• E-TTL Flashes emit a pre-flash.
Ratios
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 f/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-TX flash) and group B
flashes will be evaluated by the camera and transmitted to the flashes by the 622C.
• 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 Compensation (FEC)
The over-all automatic flash exposure can be adjusted using the camera button or External Flash
menu, combined with the on-flash setting. (This improves on Canon procedures.)
• Camera FEC can be set in 1/3 f/stop increments within
2 or
3, depending on camera.
• Each flash has its on-flash FEC added to the camera-calculated output level. E.g. if the
camera is set to -2, and the flash is set to +1, then total FEC for that flash will be -1.
• Set all on-flash FEC settings to zero, and use only camera FEC, to avoid unexpected
results.
• Using a Receiver group of All (A+B+C), E-TTL can produce uneven lighting with multiple
flashes due to differences in ambient light, flash power, distance, angle, etc. One flash can
have a small FEC of, say, +1/3 FEC to balance more ambient hitting the other side of the
subject.
• Using an A:B ratio, the ratio effect will be modified by the individual flash FEC.
Under A:B C, C flash can be set to a value, and trimmed by the Group C FEC menu.
Or, Camera -2 FEC plus C flash -2 FEC produces -4 FEC – greater than expected.
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