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The Other YN-622C User Guide

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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-pre flash “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 Compensation (FEC)

The over-all automatic flash exposure can be adjusted using the camera button or flash control menu, combined with the

on-flash setting. (This improves on Canon procedures.)

 Camera FEC can be set in 1/3-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 lighting 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 C FEC menu. Or, Camera -2 FEC plus C flash -2 FEC produces -4 FEC – greater than

usual.

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Yongnuo YN-622C Guide de l'utilisateur Page 14

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