Yongnuo YN-622C User's Guide download pdf (Page 15)

The Other YN-622C User Guide v.4.07

23/07/2014 Part 1 – The System Page 15 of 62

COMPATIBILITY

The Key

For the YN-622C (and many other triggers) it’s about what each camera body provides for digital

data in and out through the accessory shoe, and what the flash moves in and out through it’s hot-

foot. These capabilities are set by the manufacturers. However, the 622C can massage the data as

it transmits it back and forth, providing numerous functions not provided by Canon.

What’s the Problem?

Why are there several “types” of camera and “classes” of flashes? It’s due to the historic

development of the technologies.

1. There was an Accessory shoe on camera to mount a device, and a centre-pin contact to

fire a flash. All settings were made on-flash. The camera did not know what they were.

2. More pins were added, and TTL, A-TTL, E-TTL then E-TTL II were developed as key flash

technologies. The camera became increasingly aware of flash settings. Settings were still

made on-flash.

3. Canon implemented an off-camera system using a Master flash to drive one or more slaves

using light-pulse coding. Communication was one-way. The camera was taught to read the

Master flash settings, and act accordingly. FEC was added to the camera. There was no

provision on the camera for setting Manual output levels, so there was no need to

implement a control path in the flash's hot-foot. Settings were still on-flash. (Class 2

flashes.)

4. A better interface was required, and in-camera. Canon designed the External Flash menus

(from 1D-III, March 2007 on) so that the camera could both read and set ALL settings in the

flash. This meant that all flash settings needed to be digital (i.e. no positional switches). The

only flashes which can be fully controlled by flash menus are ones that have the required

communication through the hot-foot. (Class 1 flashes.)

5. The YN-622C was released in August 2012 to replace the light-pulse coding and its

limitations. Some functional improvements were added, without over-riding Canon facilities.

6. Some flashes are designed for “I just want a photo in poor light” use, so do not have the

means for the user to set output levels manually. They can handle the automatic exposure

E-TTL commands through the hot-foot, however. (Class 3 flashes.)

7. Later, after YongNuo had released the YN-622C, Canon released the 5DIII, ST-E3, 1D X

and 600EX-RT, which provide two-way radio communication. These also provide new

features like mixed firing modes (ETTL/M/Auto), channels 5-15, Wireless IDs and groups D

& E. The 622C cannot use these extensions, and the camera must be used in “optical

wireless” mode.

8. In June 2014, YongNuo released a YN-622C-TX LCD Controller unit. It provides full control

of remote 622Cs by type B cameras, and an alternative control interface for type A

cameras.

9. The Canon YN-622C is NOT compatible with the Nikon YN-622N. The cameras’ code sets

are not the same.

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