Best fisheye lens for its money? Nikon D5000?

Most I'd probably spend is $600 however I'd prefer even cheaper. I want something that has good sharpness, hopefully something that can use the built in flash from my camera and still be able to make a success full photo, and something that can work with apature mode on my camera.

I have a D5000 by the way

Not going to happen. Simple as that. You may be able to find a gently used tokina 10-17 for that kinda money.

^NO to the guy above.
Opteka 6.5mm
http://www.amazon.com/...B002KMAWO0

You're welcome

Here are the best fisheye lenses for the Nikon dSLR.

http://www.bhphotovideo.com/...4277998923

If you are concerned with sharpness and full compatibility with your camera then you should get one of those. Bear in mind that no flash is built to fire photons at an angle equal or near to the angle of view of a fisheye lens. You will have to work with multiple flashes to light a very wide expanse like that.

If quality is not your concern and you are content with only the middle of your shot being lighted by a single flash then get a semi fish-eye adapter and screw it to the front of your kit lens.

http://www.bhphotovideo.com/...hotography

I'll go with Jacob on this one. I don't normally comment on gear I don't own but I will in this case. The Opteka 6.5 is actually the Samyang 8.5 marketed under a different name (and size). Other names include Vivitar (7mm f/3.5), Bower (8mm f/3.5), Walimex (8mm f/3.5) Pro Optic (8.5mm f3.5) and others. It is a fully manual lens, has no electronics and is an acquired taste. I have the Canon 15f2.8fisheye and the Canon 16-35f2.8L II but bought the Samyang 14f2.8 out of curiosity after hearing glowing reports about IQ in the various forums. At $420 its the cheapest lens in my collection. (apart from the 18-55IS kit lens which has long been relegated to the back of the dehumidifier.) I have been stunned by its performance and have no problem recommending the brand to you. Fisheyes are great fun, however, they're lenses you will only use occasionally. You will tire of the images and so will your friends. I prefer to use mine at night. So unless you've got all other focal lengths covered you might want to rethink its position on your ''must have'' list.

I have the Nikon 10.5mm fisheye. It's an excellent lens, although your camera will not be able to autofocus with it as it is not an AF-S lens. But you can always manually focus it. And who knows, maybe someday you will buy a D7000, and the lens will autofocus on it. Always look to the future when buying lenses.

It is $700+

You won't be able to use the on-camera flash with some fisheyes as many of them have large diameter lenses, and the lens may cast a shadow on the photo. But one exception is the Nikon 10.5mm lens. As it is a DX lens, it is surprisingly small, and not much larger than a 50mm f/1.8.It is small enough that it won't cast a shadow.

You did say best lens. And as I said, always look to the future when buying lenses. You'll likely keep the lens for 10 years or more - do you want to waste money on a cheap lens and own it that long?

Just my opinion.