Review on Opteka 6.5mm f/3.5 Professional Ultra Wide Angle Aspherical Fisheye Lens for Canon EF-Mount Cameras: EOS 90D, 80D, 77D, 70D, 60D, 50D, 7D, Rebel T8i, T7i, T7s, T6s, T6i, T6, T5i, T5, T4i, T3i, T3, T2i and SL3 by Jeremy Hudson

The lens seems massive and heavy, and the focusing is very smooth. There is no feeling that something is scratched inside. I also like the tactile feedback from the aperture setting. The lens comes with a small pouch and while the packaging was excellent, this pouch confuses me. It's packaged next to the lens and fits quite snugly. I don't understand how to use it effectively outdoors, but it can absorb other things. If you use this lens to shoot landscapes, mountains, buildings, stars, etc., you don't have to worry too much about focusing. , and I think focusing on objects is a weakness of optics. The focus on the lens is really good and long, but objects in the center don't come out 100% sharp. I used the digital zoom button to zoom in all the way and really tried to focus before taking the shot, but it was still a bit blurry. Comparison of the visual fields. The photo from inside the house was taken with a tilted tripod, but this bump isn't as clearly visible with the fisheye. Not wanting the camera to be basically flat is a pretty cool feature in some ways. I've also juxtaposed some images from my 50mm Yongnuo, this 6.5mm Opteka lens and the 18-55mm and 55-200mm Canon lenses for size comparison.