Reviews and Problems with Sigma APO 135-400mm F4.5-5.6 DG
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Darryl Luck, Fredmiranda
22 April 2008
Conclusion: Inconsistant is what this lens is. I have given it a workout in different conditions, settings, hand held, tripod and I would say that for every 100 shots I would get 1 that I am just happy with. It is a fair weather lens to say the least. If you can't get 1/1000th then forget it.
Pros: Price, build quality, tripod collar
Cons: Shocking lens creep, slow AF, soft images, noise (ISO)