I have a Canon 40D with a 24-105 L IS and a 100-400 L 4.6 4.5-5.6. I know there is a 1.6x mag factor so my 24 is really 38.4mm effective. Sometimes I would to get wider angles than this and feel somewhat limited. Would you all recommend a telephoto 10-24 say or a fixed lens and which one? And what is the difference between a wide angle and a fisheye lens.
Thanks all.