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We were supplied with lenes from Sigma...we had auto-focus problems with them at larger apatures 2.8 and larger. None of our manufacturer lens either for Canon or Nikon's digital SLRs have ever had those issues.
Ace
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SIG TOO BIG! Maximum 120x60 button and no more than 3 text lines of DEFAULT SIZE and COLOR. Unless your sig is for a GFY top banner sponsor, then you may use a 624x80 instead of a 120x60.
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