Cosmicar 8.5mm f1.5 c-mount lens on a GH4. In opposite to my GH2 it does not vignette. Someone from the facebook mft community asked me to do a short hands on. So here it is. Caused by the crop factor of the GH4 it will result in something like a 19,55mm equivalent on a 35mm SLR.

It is really sensitive for frontlighting. And it has no thread for filter.
So it will be my indoor wide angle.
For real estate indoor shooting it could be helpful, cause it is wider than my beloved Tokina 11-16 and much faster.
For me the distortion is not such a great thing on indoor shooting.

Be aware, it needs to be machined cause it will not fit into any c-mount adapter without!

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