I am a happy new owner of the 645D and have been looking for additional lenses. After extensive research I decided it was worth trying some N type lenses. I just used this lens on a trip to the Carlsbad Caverns and am very happy with the low light performance. Some images are slightly blurry due to the slow shutter speed required in low light and handheld shooting. I look forward to trying other lenses in this range.
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