Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Will this fit the Nikon D7100
Document: The fit is good, the light ranges offer more options than other models. Color discs offer more options. Good value
So far so great! No problems installing, rings fit perfectly, and the instructions are clear. No photos yet but that'll come shortly.Shipping was snappy!
Light is good but the controller dosnt fit a NEX-6 hotshoe. Bit of an unexpected hassle to get one. Otherwise OK
So, it say will fit up to 77mm, yes it fit with their adapter but the image is no use. If you planning to get some hidden camera feel go for it! LOL sorry I have to return it!
I use this flash with a Nikon D7000 and it works as it should. It is easy to use and is a must for macro work. Someday I will probably replace it with a higher end unit but for an inexpensive way to start out with a ring flash and not break the bank this unit works quiet well and is well worth the money. All modes work well with my D7000 and I haven't had any issues.
So far i really love this product. I have just started using it for close up photography opportunities and it is very easy to use and works quite well for an inexpensive ring flash. Also with the host of mounnting ring adaptors included, this flash will fit every single lens I own. It also can be used in full on mode for stills or video and it is just what i wa looking for to dabble further with creative photo work without spending a fortune on an expensive ring flash.
I already have 1 ring flash but I used it for my old Nikon camera. Now with new Canon T4i, I wanted to give it another try from Polaroid, but I have to admit that I'm disappointed.Color of the light is really not even close to natural, even after doing a gray card beforehand. Light is not strong, it is useless for anything except extreme close up.
I haven't ever used the much more expensive, pro-like ringlights, but this more than meets my needs for macro photography. I like that the lighting can be adjusted in brightness, plus you can also do continuous light, right side flash, or left side flash. Includes several colored diffusers and lots of ring connector sizes to fit many different sizes of lens. Quality is basic plastic but I think will hold up ok with normal treatment.
This was a birthday present and so far it works with my camera very well. This flash may have been intended for a different dslr camera because the flash would not attach to the lens of my nikon coolplix l820 camra. However a lens adapter that came with a set of lens solved this problem, and allowed me to attach the flash to the camera. The only problem I have is that I can not use the flash setting but that is probably because the camera is not compatible with the flash.
This thing is low power, GN 7, so don't expect it to reach out more than about 5 to 7 ft but in close it throws quite a bit of light. I have used it with several Nikon lens and it even worked as a fill flash with a 80-200 f2.8 at 200 m out to about 15 ft. It worked well with both a D90 and a D600 and should work fine with any camera that has full manual capability. Be extremely careful with the battery door.
Answer: First let me say that I'm not a pro, just love photography.  The Polaroid 48 Macro LED ring Flash that I have works fantastic, not one problem.  I bought it for my Pentax K5.  According to Polaroid's web site it will work for your Nikon.  MF