I have an EM-1 Mark II. I use 4/3 lenses with a converter. And 50-200 F2.8 to 3.5 and 35-100 F2. These lenses worked great with the converter and took crystal clear pictures and the autofocus was fast. I got a good deal on a used 40-150 F2.8 here at Revain. So I figured I'd see if lenses would work better for the camera. While I'm not sure if they perform any better, they are smaller and more compact than the two huge lenses I've used. The ED 40-150 F2.8 lens produces crystal clear images. I took sports photos at my sons games. The lens immediately focuses on the subject. The photos are great. I am very happy with this purchase.
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