I enjoy using lenses from 35mm film SLRs on my MFT camera, but I know I'm wasting a lot of their glass. What other kinds of lenses are available, that were designed for smaller formats, and that give good image quality? I guess lenses designed for the original PEN half-frame cameras would have a perfect image circle for Micro Four Thirds. Are adapters easily available? Are there half-frame lenses from makers besides Olympus? I've seen "cine," c-mount, and CCTV lenses that can be adapted, but I doubt the image quality and I don't want to waste a lot of my camera's sensor area with a lens that has too small an image circle. Are there good lenses of this type that fill most of an MFT frame? Thanks for any advice.