I posted last week about the Sirui 50mm Anamorphic Lens I purchased for use with my Panasonic Lumix G9. To get the most out of it, for both video and still photography, I purchased yesterday at B&H a Tiffen Black Pro-Mist 1/4 Filter. Of course, I can also use it with my recently purchased 70 - 300 Nikon lens which coincidentally has the same size filter thread. Very basically, the filter reduces the value of highlights and lowers overall contrast. But there is really much more to it than this. For those who are interested there is an excellent article on dpreview that explores mist filter's properties in depth. It's well worth reading.