The Zeiss 35 T1.5 CP2 Super Speed Compact Prime EF is designed with low-light filmmakers in mind. A crazy fast maximum aperture of T1.5 means you can get the most out of naturally lit scenes, or light your whole scene without breaking the bank. Get creative with the super thin depth of field with the fast T1.5 aperture. The geared follow focus ring goes 300 degrees around the lens body for precise focus pulls. The iris of each lens is a 14- blade circular design, giving you super creamy bokeh in your out of focus areas. The design of the lenses eliminates "breathing" - where the image feels like it's moving when you are focusing. Each CP.2 lens has the same front diameter, similar gearing distances, and are color matched to each other.