I must admit that I was amazed by the possibilities for this price. Certainly, we must get used to the strain (requires 8 mm), having to rethink the settings (like on my old 24x36), but that's what makes the charm of photography: switch to manual mode, disregard the aperture ring (not compatible with the Nikon D5100, if enough to get to 22 and set the desired aperture on the camera) and then we discover a new world. A real treat to learn fisheye cheaply.