My Sigma 15-30 is on the camera about 40% of the time. My second most used lens is a 100mm Macro, then a 28-105mm for general shooting. I have a 100-300mm in the bag, but don't use it much. I use a Canon D60 and the crop factor frequently forces me to use a wider lens than I would select for a full frame camera. If I were shooting film I probably wouldn't use an ultra-wide lens for much except interior architecture shots. Before switching from film to a DSLR the widest lens I used was a 24mm prime. The Sigma 15-30 and 17-35 are linear wide angle lenses. They exhibit some distortion but are not fisheyes.