I have the tamron version of the Canon L series lens. It is a 2.8f I think 28-75mm lens. It's only $400 or so compared to the $1100 of the Canon lens. I like it because unlike my other zoom lenses, it is 2.8f all the way through the zoom, it isn't variable. I haven't brought it to Disney yet, but I imagine that it's going to work out well.
I'm sure I'll have to keep the 50mm for those dark rides though. You just need it for those dark situations.
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