In the DSLR filmmaking world, it 39;s always been challenging and expensive to attach a powered zoom lens onto your camera. Recently a few manufacturers have offered motorized zoom lenses at prices of 10 20,000 keeping these versatile lenses out of reach for most digital filmmakers. DSLR zoom still photography lenses are less than ideal for dramatic zoom shots because they are rarely parfocal i.e. the aperture changes over the duration of the zoom, which spoils the shot. br br Older ENG Electronic News Gathering lenses are a breed of powered zoom lenses that have many of the features that a modern digital filmmaker needs. Affordable ENG lenses are easy to find, and can create great HD video, but making them work with today 39;s digital cameras has been an expensive and difficult challenge. Until now... br br Once you mount a powered zoom on the Black Magic Pocket Cinema Camera with the PowerLynx kit, it opens a whole new world of dramatic cinematography. Create a smooth slow creeping zoom into a subject, keep up with your subject at fast moving live events, take advantage of typical 15x and 20x zoom lengths for more camera placement flexibility, etc. br br Once you source a B4 lens, adding the B4 Magic Adapter will you allow to mount a ENG zoom lens onto your Black Magic Pocket Cinema Camera, allowing you to add the creative possibilities of a zoom lens. br br Lens Technical Requirements: B4 mount designed for 2 3 sensor look for better grade lens that resolves to HD resolutions. Impossible to list them all here. Even in the SD era, there are lenses that resolve to HD quality. A little research will uncover numerous lens bargains on the secondary market with prices commonly starting as low as 100. br br The B4 Magic Lens Adapter is designed to work with lenses set to f5.6 and greater, most B4 lenses are optimized for best focus at f5.6 and greater . Please be aware that shooting below f 5.6 may result in soft focus depending on your lens.