There r a few in the mrkt now. An average kit is about sgd2000-2500 region with rails and flip exc lens. I guess the most popular brands are Letus, Brevis, Redrock Micro mainly. There are more. YOu will need the flip module with the adapter, and lots of good prime lens. Nikkor is the most commonly used for the price range and ability to control aperture. Have to set aside about 5k for a proper setup.