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 it fit the Nikon D 5100?
Document: I'm not sure why it didnt fit because it claims to fit Nikon cameras. Will be returning it and looking for one that does fit. Quick shipping. Good service.
I think it is a quality product. I use a Nikon D90 and i can't use the eyecup and the LCD protector at the same time. they both don't fit  together. I choose to keep the screen protector on.
I chose one star because it was the lowest rating. It does not fit my D600 square eyepiece. Not evenclose to fitting. Save $20 and buy another brand. Package says for Nikon but it isn't for mine.
Great quality, soft rubber, fit tightly on eyepiece. But if your camera has a flip screen like my Nikon D5000 it will totaly impede the fliping of the screen. You will need to flip the screen 1st, and then place the Hoodeye. Your screen will then have to remain in the exposed position which may result in damage to the exposed screen
does not fit on d7100..  spent over an hour trying to get this on camera a d gave up and returned.
Says its for those who wear glasses and have the square eyepieces, well it fit snug and you could rotate the cup for either eye, but thats where it ended for me. It was uncomfortable for me with the glasses on. The part that was to keep out the light pushed against my glasses, so that made me hold the camera to far away from my eye with glasses, so that let in the light and to take off my glasses defeats the purpose of the eyecup for glasses.
I was looking forward to receiving this item. I wear glasses and I thought this would help make focusing easier. However, when I received the Hoodman Hoodeye Eyecup I found that it wouldn't fit "correctly" on the D5100 due to the flip out LCD screen. The eyecup is a little too big and comes down over the screen when the screen is closed and then the LCD flip screen can't be opened.
If it attached the way most eye cups attach, taking it off and putting it back on would be OK. This thing is designed to stay on the camera most of the time. It can be difficult to remove.The pictures don't always give a proper perspective to size. This thing is fairly large. Think big enough to fit around most typical eyeglass lenses and its frame.If you don't have eyeglasses and an articulating screen, this is great for blocking light. You get a bright visual of the viewfinder.
I bought one for my nikon d5100 and loved it so much got another for my 7000. Definitely worth the $17 and really great product.
the title says for square eyepieces however the hole to look thru is circular and you cant view half of the viewfinder on my nikon d5000.. dont waste your money.
Answer: You might check this resource: http://www.hoodmanusa.com/hoodeye_compatibility_chart.asp