After many weeks studying lenses and reading lens threads, I knew a set of primes was not going to be optimal for my EFP shoots and rental clients. And I also knew Zuiko zooms would be a hard thing to market to my film DP guys. So I went to the Zeiss website and noticed the Zeiss 2.8 constant zooms for Sony Alpha, and wondered if they might adapt to M4/3. Sure enough, Novoflex does make a ZA to M43, with an aperture ring. So I ordered an adapter from Adorama and a 16-35 from Sony Style on-line and picked up the 24-70 from Houston Camera Exchange and used them all week on a corporate shoot. Absolutely gorgeous. We shot everything wide open and controlled the aperture with ND and good lighting, we never used the aperture ring---but I can tell you it is SILENT and so is the FOCUS and ZOOM. There are no aperture markings on the Novoflex ring, which is a very short distance from open to close, and there is no electronic control of iris or focus, it's all about using the zebras and waveform, your brain, and focus was just oh so easy because it is crisp and clean, and creamy everywhere else, like butter. The lenses do not have OIS at all, the Sony Alpha cameras possess the stabilization feature, not the lenses. This is not an issue for me at this time, I think that will be worked out in the future with the lens manufacturers and Panasonic. These are my first Zeiss lenses. I had no idea how pretty they could be. Or how heavy they were! I also have a Cineroid and Hotrod Tuner Kit. Read and learn about Zeiss ZA 2.8 Zooms. Stay away from the cheaper versions of the zooms that do not have constant 2.8. And understand, these zooms are for convenience, not for zooming live, although you probably could if you had to with little to no breathing at all. But the zoom ring is really tight whereas the focus ring is not so tight and works with my JBK universal wheel Follow Focus. $1800/1600/300 TTL in TX! I can go longer or wider renting primes from a good neighbor.