This 10mm T2.1 Hyperprime Cine Lens for MFT with Variable ND Filter Kit from SLR provides you with a wide-angle lens with a filter that provides a wide amount of exposure control to enhance your images. The lens is designed for MFT mount cameras and incorporates cinema style functionality such as geared focus and iris rings and a clickless aperture. The lens' non-rotating front allows you to thread the included variable ND onto the front and not worry about shifting polarizer effects as you change focus.
The main advantage to using a variable ND is that it is extremely fast to change the amount of ND by just moving the adjustment lever instead of having to swap out different strength ND filters. At only one filter ring in thickness, the variable ND is extremely thin and helps prevent vignetting, especially on wide-angle lenses.