Annie Barton tested the Kinoptik 150mm f/2.9 lens (here on eBay) on the Panasonic GH4:
We think this copy we have could be a faulty lens, or a fake Kinoptik. It eats up quite a bit of light, so it flares a lot making the image less sharp. Maybe a longer lens hood might help?
Stay tuned for the upcoming Kinoptik 100mm. We like the 100mm much better than this 150 !!
This Kinoptik Focale is modified into a Nikon mount. The focusing barrel makes the lens fairly huge. The 150mm in Micro Four Thirds system makes the focal length even longer, and together with its size, this lens is not easy to use.