I would say the Canon 50/1.8 II lens with my trusty E-P2 (they fit surprisingly well together). It's very mobile and I almost always carry it with me. For serious shooting I mostly use the Canon 24-105L on a 5D though...
« Last Edit: April 06, 2012, 03:15:23 PM by Zo0m »
Nikon D800, Nikkor 35 AF-S DX f1.8G, Sigma 85 f1.4 EX DG HSM, Sigma 150 f2.8 EX DG OS MACRO, Tokina 11-16 AT-X PRO f2.8 DX, Nikkor 28-300 f3.5-5.6G ED VR, Nikon SpeedLight SB-910
5D Mark 2, 550D, 12-24, 17-40L, 24-105L, 70-200 2.8L IS II, 50, 85, 550EX