Olympus M.Zuiko Digital ED 75mm f/1.8 is one of the sharpest lens for Micro Four Thirds system cameras.
Ideal for portrait photography, the Olympus M.Zuiko Digital ED 75mm f/1.8 (Amazon, Adorama, BHphoto) is a 150mm equivalent prime for MFT. Fast f/1.8 maximum aperture helps to achieve shallow depth of field and selective focusing effects, and also benefits working in difficult lighting conditions.
Robin Wong published a video review for the Olympus 75mm f/1.8 lens. Check it out!
Robin Wong:
Olympus M.Zuiko 75mm F1.8 is one of the sharpest lenses from Olympus, and if you want to get the most blur in the background of your shots, rendering extreme shallow depth of field, this is the must have lens. For such a long reach, the 75mm is indeed small, compact and the optics packed into the lens are simply fantastic. I am always impressed with the images taken with the Olympus 75mm F1.8, though I do not use it often, but the small percentage of images are surely keepers.
Olympus 75mm f/1.8 lens at Amazon, Adorama, BHphoto
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Tried the 75mm recently in the test&wow program.
It is sharp, yes. It is also very good in low light.
The AF is not very fast and it hunts sometimes.
Also I find the fixed focal length has its limits. It is fine for portraits. However, if you want to change the framing by stepping closer or further, you need quite a bit of space. In live situations this means you can create so much space that other people move in between you and your subject.
I also tried it for sports. Again the fixed length is a limit there although the wide aperture is a plus.