+1 for me on the Tamron. It's just right for general and wedding. I've just ordered it as my walk-around lens, and my 24-70L will retire after its arrival.
I have owned the Canon as my first DSLR lens, it's certainly not as good for wedding, it's very slow comparing to a f2.8. The distortion is visible at 17mm.
I don't know too much about the Sigma, but overall I would like to believe that the Tamron will be right for what you do.
My $0.2.
I don't know what to do?
How will Canon work in low light with Canon 430EX Flash?
I don't see any Sigma fans!?
I would like to hear what they have to say!
Originally Posted by djdalibor
It will work as stated: it's an f/4-5.6 lens, and the 40D is an ISO 1600 camera (at best). The flash is a guide number 43m flash, so it can illuminate a scene of up to 43m away at ISO 100 and f/1. If my math and memory are correct, that's essentially equivalent to ISO 1600 and f/4, but assumes the flash is zoomed to the full telephoto position (105mm). Therefore, at the long end of the lens and the flash zoomed to 105mm (i.e. not covering the whole scene), you can light a subject 21m away, about once every four seconds. That's at max power and max aperture - you may want f/8 for better optical performance, cutting your max distance in half, and/or you may want lower ISO for less noise, again cutting your max distance in half.
I wouldn't want to be living on the edge like this. You'll need to keep a close eye on the flash confirmation light, and you'll spend a lot of time trying to choose the lowest ISO that gets the shot.
We're a Canon/Profoto family: five cameras, sixteen lenses, fifteen Profoto lights, too many modifiers.
I know this is off topic...
I just bought off a Olympus E-420 with the 25/2.8 pancake lens in prestige condition for $380! The guy who had it didn't even used it at all and now it's mine. Absolutely a great deal for the money! Since it just happened, I'll just return my Tammy when it's arrived...
It seems the small olympus will do a better job to walk around with me - it's really just that small in my hand like a toy, and it weighs almost nothing
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