I would like to get just 1 lense for coverage I need at least 24 -100 using the 5D. Is there one GREAT Glass that I can get with the Best quality.F2.8 is what I need and I dont know if I need IS or L with the lense. I shoot a lot with flash and of outdoors with fill flash. I use ISO 400 most of the times. What I am asking for is the one Best all around lense to use . Thank you, rollsman
I have no clue why anyone would drop the money on a SYSTEM camera and limit themselves to a single lens. The best two lens combo you can get for yourself is a 24-70 and 70-200 combo. I'd personally go 16-35 with a 70-200 but that's personal shooting habit.
It may be better to ask this question in a Canon forum; we don't have too many experts in Canon glass here...
Having said that, there are no lenses (of any brand) that cover the whole 24mm-100mm range with an f/2.8 maximum aperture. Canon have their 24-105mm f/4L lens which fits your requirements apart from the aperture.