the unique properties of fisheye lenses mean that normal focal length/angle of view comparisons don’t apply, and the 15mm fisheye actually has a much wider angle of view of 180 degrees ...

The taller the column, the better the lens performance. CA (Chromatic Aberration) is measured with any in-camera corrections ... as we stop down. You can view additional images in the Equipment ...

this ultra-wide lens offers a huge 110° angle of view – though of course, that 15mm focal length will become 22.5mm if mounted to an APS-C body (or 24mm on a Canon APS-C camera). While its size ...