Marcos Villaroman wrote:
I use my DSLR for snapshots, travel, and times when photography isn't the most important thing going on. For that I want the utility of zooms --- especially for my standard walk around lens. You can't always get the framing you want by zooming with your feet. You may not want the pain of swapping lens and missing a shot.
The 24-105 and 70-200/4L IS are excellent zooms; I can compensate for their lack of speed by cranking up the ISO. Sure I don't get the option for shallower DOF like I would with a prime, but, they are close enough. I can see using those two focal ranges as separate from each other requiring less swapping --- normal focal range for most things; telephoto range when you are stuck in the back of a crowd at a parade, can't move, but, need to get wider and tighter shots close together.
But, if you can be more methodical with your shooting and lens selection, sure primes are great. I've traveled with a set of primes on occasion (e.g., Rotinkon 14/2.8, 35L, 85L, 135L) or even lighter/smaller (35/2, 50/1.4, 100/2) and had a great time.
I also have the option of bringing two bodies: 5D2 and 5D3. That option makes using primes even easier.