SERIES 1 Vivitar 8mm F3.5 Fisheye

Here's another question. Has anyone had experience with the SERIES 1 Vivitar 8mm F3.5 Fisheye?

I am not a great wide angle enthusiast but, have several ideas for using an extreme w/a or fish eye lens but,the price of most fish eyes are beyond what I desire to spend for a lens of this type. However, I have found this SERIES 1 Vivitar 8mm F3.5 Fisheye for only $150 USD with free shipping on Amazon.com. This lens is available under multiple rebranded names...

I do realize that on my Canon cameras, there is no electrical connection to stop down from viewing to shooting aperture, meaning that I will need to work at my shooting aperture. I also realize that this is totally a manual focus lens.

Perhaps, if I was considering this as more than "an occasional use lens" the above facets would bother me. However for my usage, and the lens price; I can live with these restrictions. If I cannot, or in the unlikely event that I absolutely fall in love with using the fish eye, I can always sell it and get another more sophisticated lens without incurring any great financial loss...

I know that I am bucking the trend, buy I expect to sell both my 5D2 (which I purchased used as an experiment) and one of my 7D cameras and use the proceeds to buy a refurbished 7D2. I am very happy with my 1.6x crop frame Canon DSLR cameras and plan to continue shooting the crop format...

I had the Opteka 6.5mm fisheye which is the same lens as the version 2 Vivitar so I assume it would be the same as the Version 1 considering it's sold by so many different names. I really liked it for shooting skate photos; at f5.6 it's extremely sharp. f3.5 is TERRIBLE though so if it's lowlight you're gonna need to pull the shutter down (which shouldn't be too bad considering it's about a 12mm when you factor in the crop). The opteka lens is also $150 on amazon so I'd probably recommend you buy that one because you can remove the hood and get some really cool photos on your 5D. The build quality isn't too bad; mine broke but only because it got hit by a flying skateboard.