A while back Ike posted a question about how to handle Flash Exposure Compenation (FEC) in the D70 implementation. At the time the digital rebel ettl housing had a nice implementation that actually gave the drebel FEC that wasn't supported in the camera. Now we have a camera that supports FEC in the 20D which also has Ike ettl2 with FEC.
So how does it work? Does the housing communicate with the camera to dial in the FEC the way an SB800 works on the D70? Or does the Ike ettl just translate the ettl2 signal and adjust it up or down a stop accordingly?
A simple way to test this for 20D housing owners would be to take a series of shots at various FEC levels and then examine the XEIF info in the files.
Maybe Ike could enlighten us?
So how does it work? Does the housing communicate with the camera to dial in the FEC the way an SB800 works on the D70?
Assuming that when you change up/down compensation on the flash/converter it updates on the camera display as well, yes.
~Matt Segal
The Ike 20D housing is designed so that you can set FEC using the Ike buttons on the back of the housing.
I'm not sure, but I think you can also use the Flash +/- on the camera as well, but I can't confirm that.
Cheers
James
The housing settings override the in camera setting. If you have the housing set to FEC=0 then then it will follow the in camera settings.
With Canon DSLRs that allow the user to set FEC on camera, the strobe converter settings, if anything other than zero, will override what is set on the camera. This is the same way that it works with a Canon external E-TTL II flash.
With Nikon DSLRs, the FEC set on the converter will ADD to or SUBTRACT from what is set on the camera. So if the converter is set to +1 and the camera to -1, the FEC would be zero. If the converter is set to +1 and the camera is set to +1, the FEC will be +2. The SB800 and SB600 work in the same way.
