Excerpt: I've thought about buying this lens for a long time but felt I might not get enough use out of it. When the $ rebate was offered in early January, '15 I ordered it from B&H. While it is an $ investment, the quality of the lens and its casing is excellent.
Pros: Durable, Fast / accurate auto-focus, Lightweight, Rugged, Strong Construction
Excerpt: This Sigma 4.5mm was bought for night star shots, horizon to horizon, and it does that indeed. In other uses, if one can keep one's feet out of the frame, it is wonderful for cityscapes. A walk in the park can be almost magical with this real fisheye.
Pros: Consistent Output, Easily Interchangeable, Much Fun, Strong Construction
Excerpt: This is the most extreme fish eye lens you can get for a APS-C camera. With a full 180º view, you get a full circular image, like the Sigma 8mm FE on a full frame câmera. Good lens quality. Luminous, fast and an excellent minimal distance of focus.
Pros: Clear Optics, Easy To Use, Firm Mount, Strong Construction
Excerpt: I use this lens to create stunning and unique photographs. It is optically sharp and extremely well made. Use a horizontal rail attachment to place the vertical plane of the lens beyond your tripod legs. So far, I am totally satisfied with this product, it performs well on my K-10 & K-20 bodies.
Excerpt: I'm using it in a research project on daylighting architectural space. The circular fisheye allows you to analyze the entire space in a glance...and it works seamlessly with my Nikon D5000. No down side.
Pros: Consistent Output, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Rugged
Excerpt: I have been shooting sport photos for a while now and was looking for something new to spice up the images. I wasn't sure how I could use the fisheye but now I have had a chance to use it... wow. I can get some excellent images from a perspective I have never used before.