The LM12HC C-Mount 12.5mm Fixed Lens from Kowa is designed for 1" type sensors. It offers a 55.6° horizontal field of view and an f/1.4-16 aperture range to capture clear images in varying lighting conditions.
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Amazing lens for gh4. Very small and light shoots great in low light situations ( f/1.8) and is the equivalent of a regular 12mm on the gh4. That is hard to find for the gh4 without using any adapter
I used this lens on a cross-country road trip, using the Blackmagic Pocket Cinema Camera on a suction mount inside the cabin of a truck. Even looking through the window glass, when I switched lenses from a high end Nikkor Zoom to the Kowa 6mm, during the edit, you could see the marked jump in acuity. Given the lack of filter potential (a weakness for a native ISO 800 camera) I could only use this lens at the very beginning and end of the day when shooting in the truck. There was no room for a matte box system, needed to get an ND working. This lens will stand up to most any prime lens, and is a welcome (wide angle, finally!) addition to any pro shooting situation with the Pocket Cinema Camera.