Nikon TTL...err yes

[AJQS]

Does anybody really understand any of it? I can use a manual flash. I can use a Thyristor flash. I can't make head nor tail of how any of this Nikon iTTL stuff works though or how I even go about getting it to work in it's most basic form on my S5. (Speedlite is a Sigma 500 something or other)

So where can I learn how to tame it? Google just wants to sell me a new speedlite or a D4!

 

[specialman]

iTTL fires a pre-flash before the main exposure. This pre-flash is metered by the RGB meter in the viewfinder, with the lens wide open. Exposure determined, the main exposure happens with the mirror raised and shutter activated. It all happens in an instant.

Then you have CLS, which is multiple wireless off-camera flash. Same principle just with one or more speedlights away from the camera. This can be controlled by the pop-up flash on the camera, by a hotshoe mounted master speed light, or an infra-red SU-800 unit

I don't know the Sigma flash so don't know what functions it supports (2nd curtain, off-camera etc), so it's hard to say how best to use it.

 

[robahob]

Hi Richard, it really depends on the exact model of you Sigma flash.
The S5 uses iTTL and is capable of CLS as it has a commander mode built in to the pop up flash. It may sound obvious to say go through your manuals, you may also want to search the discussion threads at strobist.com

 

[david357]

Have a look here Alan for an explanation as to how the CLS works. I think that the Sigma 500 should work with the system, and you could use the built in flash on the S5 to trigger it.

Give me a shout if the Sigma doesn't work, and you can have a play with an SB800 to give the CLS system a try if you want! It does work, within limitations (flashgun can "see" light from on-camera flash, not too much sunlight).

 

[AJQS]

Cheers - Dave may have to take you up on that! The Sigma does everything, CLS, High Speed Sync, modelling light etc...just the instructions are terrible and the controls are as intuitive as Quantum physics!

Doesn't help that Fuji wrote their (also terrible) manual assuming use of Nikon flashguns and Sigma wrote theirs assuming Nikon cameras!

I think I've got the basic settings sussed now for on camera work anyway!