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Messages - CliveB

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1
Lighting / Re: YN-622C multiple on camera flashes
« on: June 23, 2013, 08:05:41 PM »
From "The Other YN-622C User Guide" p.10:

Two-Shooter Setup (John UK technique)
A second shooter can share augmenting flashes. There is a problem – preventing the zooming and firing of the other camera’s on-top flash.
•   Camera 1 set to E-TTL or Manual, and Firing Group A:B at some ratio/power.
•   On-camera 622 set to Remote mode and Group C, with an on-top flash.
•   Camera 2 set up the same.
•   Enhancing flash stand with remote 622 set to Group B, plus flash.
•   When either camera takes a shot, it's on-top flash is treated as Group A, the augmenting flash as Group B, and the other camera as Group C. Group C is not enabled in Firing Group A:B, so does not fire.

https://docs.google.com/open?id=0B77OmmGIg0gMVFpqNkpBYXBHajA

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Update on 622c with 6D: I found that one transceiver gives me different exposures than the other when on Camera. Also when the flash goes to sleep the one transceiver can wake it up. The other transceiver does not does not.
It is likely that there is no problem with the 622s.

When you place a transceiver on a camera, the transceiver's settings are applied to the camera's flash control menus. If one has an FEC of zero and the other has FEC -1, the camera will behave differently, according to the unit mounted. There are other settings that do that. It can be worth using one as a dedicated transmitter to avoid this hidden change.

You may have found "The Other YN-622C User Guide" helpful.
https://docs.google.com/open?id=0B77OmmGIg0gMVFpqNkpBYXBHajA

PS I have tested the 6D with the 622s, and they performed flawlessly in all features except one. I couldn't find the DOF button to test the modelling light before the 6D was wrenched from my grasp.

3
One that does not have this problem is the YN-622C. There will be a pre-flash from flashes in E-TTL mode. E-TTL flashes in Manual mode will not emit a preflash.

More details in
https://docs.google.com/open?id=0B77OmmGIg0gMVFpqNkpBYXBHajA

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Lighting / Re: Yongnuo flash sync
« on: December 30, 2012, 12:14:01 AM »
I don't know if 602s or 603s work with 622s - does anyone else know?
...
Edit: Has anyone ever wondered how E-TTL II gets the ratio right, regardless of the relative power of the flashguns? It's voodoo!
A 602TX can be mounted on a 622, to drive 602RXs. There is quite a hit on the sync speed, however.

Under E-TTL II, the camera takes 5 exposure readings (Firing Group A:B C). Ambient; Group A; Group B; Group C; Ambient.) If a flash in any group does not handle E-TTL, then it will not fire and will not be included in the evaluations. It measures reflected light, regardless of power, distance, bouncing, modifiers, etc.

5
Speedlites, Printers, Accessories / Re: Flash transceiver
« on: December 22, 2012, 09:14:23 PM »
You may find the info in my "The Other YN-622C User Guide" of interest:
https://docs.google.com/open?id=0B77OmmGIg0gMVFpqNkpBYXBHajA

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