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Latest Review Posted Sigma APO 135-400mm F4.5-5.6
I've only just received this lens from the marketplace used here, it's the older non DG gold ring version with smooth plastic not crinkle finish. Essentially identical minus the zoom lock & DG rear coating. First impressions were mixed, I got some good shots stopped down but wide open even at lower zoom levels I had what appeared to be some soft images. Further investigation revealed back focusing big-time :hmm: Thankfully an easy fix with the K20D and a full +10 on the adjustment menu it sorted. Before After I highly recommend checking this lens for focus issues, especially if you own a camera with adjustment (K10, K20 -> K5/K7 etc possibly others) It wouldn't surprise me if people have been disappointed in this lens when focus issues are the culprit Even at 400mm the lens is sharp if stopped down, even F6.3 makes a good increase in resolution (my non scientific tests on text @400mm made a clear different from F5.6 -> 6.3 but not a large jump from 6.3 -> F8). It's not super sharp 400mm wide open, but for example is sharper than the 70-300 @ 300mm wide open (easily). Could be used in a pinch. Zoom ring is stiff, and not super precise but workable enough if you aren't fussy (and at this price it was a good value lens!) Auto-focus is standard noise for screwdrive, fairly snappy speed and rear element based so no annoying front element r...

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