Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Will this work on a Nikon D90?
Document: I use this flash unit with a Nikon D90 to take dental photography with great results. It is incredibly light and the remote flash units synch perfectly with the command function of the D90. The flashes can be swiveled around the lens to provide full lighting. Its a lot of money for the kit that contains many filters and a lot of other accessories that I don't use, but the results speak for themselves.
I am an amateur photographer (my favorite hobby). I use a Nikon D90 and have a number of Nikon lenses. I had gotten the Nikon 105mm macro lens and it is truly one of the cleanest and sharpest lens I've ever seen. I had used it with macro shots (and it does a great job with portraits too) but I kept finding that even though I didn't have to get so close with the 105mm, I still had issues with getting the light just right.
When I had the need for a Macro flash, I looked at the Nikon R1, the Metz M15, and the Sigma EM140. Unfortunately, I went with one of the cheaper 3rd party units, and it would not work in iTTL, even though it claimed it would.So I returned it and bought the R1.
The flash(es) work just as advertised. The carrying case could be a little more user friendly but that is just a nit. I bought this for the speedlights, not the case. My only complaint is the seller. Mine came with a very torn box (I save all my boxes for resale) and it  had obviously been opened and rummaged through, perhaps even used? My advice, if you have the need for a close-up speedlight this works just as Nikon suggests.
Well, at least the CR123As don't weigh much.Today is Aug. 11, 2012. I am still using this kit and I have a few things to add to my review. First of all, yes, it works fine with the SB-900 flash. I have used this kit on the Nikon D300, D3x, and D800E. The built-in flashes on the D300 and D800E work with this kit. All of these flash solutions, of course, require line of sight to the remote units.
Nikon has a compatibility list at [...] which shows all cameras and all flash units in a matrix. It appears that so long as the camera has some built in flash, the unit will work (Nikon, not sure about others).Also - update on batteries. You can now get rechargeable CR123A - a great money saver. Take a look at Tenergy TN268 Li-Ion Battery Charger + 4 pcs RCR123A 900mah Rechargeable Batteries - a nice charger and good power solutions for this flash unit.
I suppose it's the "Mickey Mouse" component, but I have no fear that they will fall off.It's true that these are minor things and the flash system works great, but this system could have been all the better.I am using the R1 with my D90, and am using the camera as the remote commander, so I didn't need the R1C1. I am using one flash on Group A, and the other on Group B.
They really do a good job!! !I also tried them for product photography and I was very pleasantly surprised at what great light they provide. The wireless with my D90 is truly a dream. When shooting macro, I found you can even put one on one wireless group and then use another group for the other. I would bring the flash level down on one side to give a different perspective in lighting. It works like a charm!!!
PS - Dont put the super-cheap batteries in it - they dont work as well as a reputable battery.
This is a great addition to the speedlight family, but check to make sure it will work with your speedlight before you buy it. These use CR123 batteries, so just be aware of that.
Answer: Hi Susan, Yes, but with the correct lens. You mount this on the end of the lens so the diameter is important. Further, if you use a zoom that changes length as you zoom, it won't work with that. Too heavy for the lens mechanism.