Summary: After using some sub-par fisheyes in the past, I am incredibly pleased with the quality of the field of vision of this lens. Absolutely NO vignetting. For the price, its a no-brainer for shooting skateboarding (as I do) or other action sports. Gives a very different perspective that is fun to get creative with. See my comparison image for an example.
Summary: I never leave home without this amazingly fun and crisp lens! The widest fisheye I've seen and at this price it's a MUST HAVE! I laugh at the fisheye L lenses after seeing the fantastic results I get from my Opteka!
Good Value, Not Easy to Use, Generally Good Results
88CET Dude, Amazon
27 June 2014
Summary: This lens, being fully manual, takes considerable effort to use. The exposure meter (the light-meter quasi-needle in the viewfinder) doesn't often seem to give a reliable indication of exposure, so I generally do a lot of manual bracketing, and then viewing the photos on-screen to make sure at least one is not way under- or over-exposed, then sort it all out on the computer when I get home.
Summary: Fantastic fish eye for little money. Very easy to focus on my Nikon D800 -set in DX mode . Even though there is a crop the lens gives yo a very wide field perfect for creative work. The optics are sharp and the lens is a pleasure to use. You don't have to worry about you're legs getting into the photo in the DX mode. I'll be taking this as one On my way! Lenses to the Canadian Rockies in Early June and expect to get stunning landscapes , star trails, etc.
Summary: The glass is very low quality so that the pictures at 100% in camera raw / CS6 looks like good pictures at 250-300%. The construction looks and feels solid and nice. The focus ring is smooth and the aperture ring is exact, you can feel when you change the aperture value. Unfortunately is a quite limited range of values but enough. Having so short focal lenght (6.5) you can enter in hyperfocal at short distances. Good for amators only.
Summary: At 6.5mm this is a remarkably wide angle lens. Some people have called it a fisheye lens and (imho) that is not correct. A fisheye is a special effects lens that is designed to make lines not running through the center axis appear curved. Kind of like taking an undistorted image and wrapping it around a ball. Unlike a fisheye, this lens does a remarkably good job of *not* distorting the image. At 6.5 mm it will never be perfect.
Summary: I will say this, for 250 your not going to find a better lense, great for shooting documentaries, or live music because its very easy to use, just point and shoot. With that being said, it is very bad in low light settings, and the actual quality is worse than the standard kit lense that comes with a t3i. Still, i think well worth the price, a very helpful asset to add.