The Canon EF 15mm f/2.8 Fisheye Lens is a sharp prime that produces a 180° angle of view for intriguing effects. It is, however, noisy when autofocusing and not suitable for video. With a full frame camera, you will get a lot of intentional barrel distortion. You may also experience vignetting. On a crop frame camera, this is a great super wide lens suitable for event shooting. The fast maximum aperture is handy in low light. This lens is ideal for events, landscape, interiors, cityscapes and other urban settings, and night sky photography.
The order is as follows: 1) upload to the site spherical panoramas from which you plan to create a virtual tour; 2) from the list of uploaded panoramas add each panorama to the virtual tour (Add to 3D tour link); 3) open the created virtual tour, edit the panorama order, select the main panorama, set transition points (tunnels).