i'm looking at a walk around lens to compliment m 5D2. thinking about the 24-70L f2.8, cuz i love to shoot wide open. but i've heard of issus with back focusing. how can i tell which serials are affected? is there a site that i can check?
another lens i'm looking at is the 24-105L f4. i kinda wish it's available in f2.8, but the price between the two is not that much different. also if i'm buying used, it could be just as good.
so i'm torn between the two. i have a 70-200, so going with the 24-105 might be a bit overlapping, but as walk around lens, it may not be that bad.
or maybe i should get the 28-300L as walk around... lol... trust me, i thought a lot about that. might be heavy as hell.. but i did it with my 70-200L f2.8 IS in SD Zoo and our trip in SD.. and it wasn't that bad.