So before you buy this lens you need to understand that this is a fully manual lens. It is manual focus and manual aperture. There are no camera controls that will be Affecting the lenses settings. No signals sent. This is a completely manual and through the lens view. I don’t even think it has a stop down function. So what you see is what you get.This lens is a massively ultra 16mm wide angle. But the image is still rectilinear. This is not a fisheye lens. This thing has an amazing field of view and pretty decent clarity for the money. I have to say overall I am fairly impressed with the image quality upon first impressions. I haven’t used it very much yet I’m definitely gonna take it out for a full test drive this weekend.The belt quality seems very nice it is a heavy all metal lens with a nice lens hood that does not interfere with the image. You can see that there’s going to be cut outs because a wide angle lens typically will not have a round hood.The focusing ring and the aperture ring move very smoothly but are not loose. They are about 3/4 of a centimeter wide so pretty narrow but still allowing you to get a good grip. This lens really does have a good build quality. And decent glass although I can’t get specifics on where the glass was made and what foundry it originated in.No focusing is not usually that big a deal with the white angle lens because after a few feet you’re good to INFINITY anyway. I’ll bet you’re definitely gonna wanna make sure you get your aperture settings correct. One of the downsides of this lens is you won’t be able to use any automatic functions such as auto bracketing and HDR. As all changes on the lens will need to be made through the ring, not the camera.What this gives you as a lens that costs multiple hundreds of dollars less than a fully automatic lens that would deliver the same image quality so I am happy to have this. I am typically not in a rush when I am shooting Ultra Wide angle, so I can take my time and set the lens up correctly. Return here shortly for some photographic examples but all in all I’m very pleased.I’m giving this lens five stars with the caveat that the price definitely is taken into consideration. I think it’s in general a four-star lens but at its bargain value price of $300, they did pretty good.