Technically, any zoom lens with a zoom range falling below about 50mm (APS-C) or 70mm (full frame) can be considered a wide-angle zoom, but these days, people are generally talking about the ultra-wide zooms in the 10-30mm range, which have become quite popular over the past several years. Historically, lenses in this range were either fisheye or optically flawed, but because of recent advanced is computer aided lens design, we have a collection of lenses that are optically quite good. […]