Sigma has announced it's new 120-300 f/2.8 image stabilized [OS] lens. The lens is said to boast a weather resistant body and a fast, quiet HSM motor. The original version of this lens received average reviews, with complaints on speed of the auto-focus and it's weight. Sigma tagged their original 120-300mm as "compact & light-weight," but it weighed in at a whopping 5.7lbs, 2 lbs heavier than the Canon 28-300. The MSRP has not been released, but the original version of this lens was announced at $4200USD.
Other improvements include better optical performance, reduced flare and ghosting and better correction of chromatic aberrations. Unfortunately the cost of R&D is passed down to consumers.
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