Designed for the digital cinema market, the Leica Summicron-C 25mm Lens (C for cinema) features a stainless steel PL mount and provides a smaller, lighter, albeit slower option to the renowned Summilux-C series of lenses. The 25mm focal length is a wide lens for this format, and it can be useful when shooting in tight spaces. The 25mm focal length is commonly chosen to be a part of standard lens packages. The small size of the lens makes it suitable not only for regular production but also for stabilized rigs, aerial cinematography, and stereoscopic 3D capture. Projecting a useable image circle of 36mm in diameter, it is compatible with a variety of cameras that have sensors that are slightly larger than Super 35. The T2.0 maximum aperture is consistent among the range, so there is no concern about exposure variations when cutting between Summicron-C lenses. Each lens incorporates geared focus and iris control rings, which share the same position, so swapping lenses can be done without having to adjust your follow focus or lens control system.
The lens features an internal focus design, which means a non-rotating front perfect for clip-on matte boxes. A generous number of focus marks are distributed along the dual focus scales, and the 300° of focus rotation provides for accurate focus pulling. The 95mm diameter front is standard across all Summicron-C lenses, and, except for the 15mm and 135mm, they feature similar weight and the same length.