Greg,
Mr Darcy wrote:You can do that with your D70.
Not to the extent I want to.
I know I can fire the SB800 and SB600 remotely, but they have to be set the same. I cannot have the 800 fire at full power & the 600 at 0.25 power.
With careful placement and diffusers, you can do all manner of things.
Also, you might like to consider the acquisition of stuff like a pocket wizard or maybe some light triggers for the off-camera units. These will permit you to use them in
modes other than iTTL, which affords you a much greater level of control than what you're currently being frustrated by.
Do you have a handheld lightmeter/flashmeter?
I don't have studio lights. I wish I did, but I need to be mobile, and the flashes enable that.
Using a few simple implements, such as noted above, will permit you to do this. Also, there are some very inexpensive kits available. These provide lightstands, brollies, and small flash heads for a fraction of the price of an SB800. Indeed, the cost of the units I've seen approaches the cost of just a stand + brolly from Vanbar (who are not at all expensive/unreasonable to begin with) and thus you can add quite a bit of versatility to your kit for very few $$$$.
Also, the popup contributes SOME light to the final picture no matter what I do. Normally it's trivial,
It should be less than trivial.
A couple of months back somebody did some tests of exactly this, and proved that any light added by the popup contributed nothing at all to the exposure/image.
If you find that you're seeing the lighting affecting your exposure, then there's a problem in how you're setting the flash. If you're seeing too many reflections in the image, then it may be an issue in your posing/presentation of the subject matter: do you have a light tent, for instance?
Now I am using the 800 onboard to control the 600 remotely. I am bouncing both, and still using a card to block any direct light from the flashes. It is getting better, but I am still not there yet.
I think that you should be able to use the 800 to control the 600, and also to have the 600 using different settings from the 800: it needs to be set to be a controller, rather than a slave.
I will drop a sample into beginners questions in a few days as I cannot crack the solution, but I am busy with other things at the moment.
As and when you're ready.