This Adapter for 2/3" B4 Lens to Micro Four Thirds Camera meant to connect 2/3" B4 mount lenses onto a Micro Four Thirds camera. Depending on the focal length of your lens, some vignetting may appear in images.I'm using Lumix GH 2 camera with the BCTV zoom lens in this tutorial. B4 adapter can be found on ebay or amazon.Thanks for watching don't forget to like, subscribe and coment.