Bought this after lengthy research, Flicker, BandH, as well as other places on the net. Its a manual lens so you will not like it if you are used to AF lenses. But the glass and optical performance of this lens competes with lenses costing 4 maybe 5 times what this costs. Bokeh is silky smooth, tones and color reproduction absolutely natural. With a 1.4f arp. the depth of field is extremely shallow, that it makes focusing actually very easy. You either in focus or you are not in focus. On a crop sensor you obviously not at 85 mm, but longer tele, for me its a 1.6 crop, so about 136mm. So if you know how to operate manual lenses, and would love a semi long 1.4f lens for film&video work, take a long look at this one. And overstock has nice prices and fast shipping.
I bought this for its long reach for wildlife photos. I also use it on an olympus body. Autofocus speed and tracking are fair, but that is also dependent on the camera body. Image quality is excellent, I have taken images with this lens that rival National Geographic. There is some purple fringing, but it is mild and easily removed in Photoshop. The lens and camera fell on a hard dirty surface when a cheap plastic aftermarket clip broke, but both still worked fine afterwards, so I would say it is a durable lens. All in all, quite pleased with this lens.
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