Thanks for all this advice guys... Yeah at the moment I've got the FE-S 17-85mm IS lense but well I'd really like to get the sigma 10-20mm one day and pretty much wanna base it on something wide angle cause that's what I'm really enjoying at the moment AND I can always use it with a longer focal lenght without any troubles but not the other way... So is the A series the one to get? cause then I can go buy me a more apropriate filter holder and some filters....  Cheers,
Kai.

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