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Latest Review Posted Sigma APO 135-400mm F4.5-5.6 DG
My copy is sharp from wide open, but only after fine focus adjustment.
At 300mm, it gives brighter images, over exposed by ~2/3, less contrast.

I am not expecting much when using it first time, but the results are good to very good, especially at 400mm.
The results need some post processing to bring the best out, typical increase/normalize black level.
Samples follow shortly.

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