Looking for Answers about Nikon Inc. R1C1 Wireless Close-Up Speedlight System?

It depends mainly on the lens.
Example; works exceptionally well on lens that have internal focus; meaning the lens barrel does not move in and out during focus or zoom or moves very little.

Limited use on lens which the lens filter housing retracts into the lens barrel or wide angle lens.

The R1C1 comes with a complete set of adapters for most lens - they screw onto the filter threads of your lens, then the plastic ring snaps onto the filter adapter. Followed by the flash attaching to the ring. Thus if your lens retracts into the barrel during zoom or focus then you would have limited use with that lens in the standard configuration.

Keep in mind - Nikon calls the R1C1 a wireless Creative Flash System for a reason;

You don't necessarily need to mount the flashes on the adapter - I sometime position my flash off the adapter on the supplied flash stand, or sometimes just hand hold the flash where I want it. As long as the flash remains in the line of sight of the SU800 it will receive the commands to fire and work perfect.
Although the R1C1 is mainly for Micro work - it is great for in home studio where you have more freedom of flash placement for portrait or desktop close up work. I currenly use 4 SB-R200. They work great for close up and fill flash -

It will fit most anything with the adaptor rings. It is designed for macro use so if you are trying to use it for something else I would have a rethink as they are just not powerful enough for any distance work.

You were correct, I use the R1 system (this s the R1C1 minus the SU800) with both my D700 and D7000, they can both operate in te "Commander" mode.

In a word, yes. There is an adapter ring in the kit which will fit the 77mm filter size of that lens.

You dont have to use but it is advisable as the flashes and adaptor are quite heavy and af struggles, its a bit easier to use manual focus, to be honest I never bothered to get the adaptor when I had the 60mm, always managed without it as it is rather expensive for what it is.

yes, it should be no problem...I use my SB800 as the commander all the time, the SU800 is awesome to fire all flashes though...
hope this helps...