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Anonymous
As I've heard, Sigma has two major issues: - Problems with compatibility (happen mostly to Canon mount lenses) - Problems with QC (happen even to EX-series primes, so try before you buy or make sure the store has a decent return policy)
As for focal lengths, the "best" one depends on the kind of portraits one wants to take: 85mm is the most versatile, 50mm is more suited for full-body and family portraits, 100/135mm are better for faces. (These numbers are for 35mm film, so divide then by the crop factor for digital)
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