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Re: Please Help Me Decide on Various Upgrades
I've got the Sigma 10-20mm too, and it's a cracking lens. However, if you want something fast have you considered the Tokina 12-24mm lens? It's a fixed f/4, which is significantly faster than the other zoom wide-angle lenses at the 'telephoto' end, and is supposed to be superb - it would have been my choice if I hadn't wanted the extra 2mm at the wide end.
Remember that the wider the lens, the longer your exposure can be and still get a sharp picture - at 12mm you should be able, with practice, to hand-hold at 1/15th second and get a sharp photo.
I love my wide-angle lens, but couldn't imagine going to a wide prime - I find that the flexibility that the super-wide zooms give you is unrivalled by anything fixed in that range, and 20mm simply wouldn't be wide enough for me anyway.
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