On 11/18/11 2:38 PM, Aaron F. Ross wrote: > The rotating shutter was > developed precisely because of the eyestrain of flicker, and it's > only a partial solution.
Actually, the rotating shutter was invented in camera to cover the film as it was transported, thus not having a smeary image. It has noting to do with eyestrain. Flicker at 24fps can be quite disturbing, which is why (film) projectors have a two or three bladed shutter, the higher the flicker rate the less noticeable to the conscious mind, the less distracting. The less distracting, the more likely to allow the audience to slip into "Cinema" watching (my interpretation of the process) This is not an endorsement for higher and higher frame rates of projection or capture. Some cameras have a black stripe that bisects the mirror shutter of the camera which increase the flicker rate to the cameraperson's eye while shooting. Thus providing a less jarring image to the cameraperson. The first motion picture cameras had what was known as a focal plane shutter, and you viewed the image by focusing through the base of the film. So I've been told. With 3 strip technicolor cameras this seems highly impossible to create, with the single strip color film an anti-reflective backing was added to the film, making it impossible to focus on the image through the back of the film anyway. Viewing was achieved by means of a Parallax viewfinder system. For reflex viewing a beam splitter arrangement, was used. Both of these systems provide a flicker free image to the camera operator. Arriflex invented the mirror reflex shutter, using the mirror to both divert the image to the viewing system while the film is being transported. Pretty much all film cameras and projectors have a rotating shutter for when the film is transported I think Imax may use some other system to transport the film. The Eclair ACL did have a reciprocating mirrored shutter - but that was only for viewing, the actual shutter for exposing the film was a rotating focal plane shutter. I hope this clears up the confusion about the origins of the rotating shutter. -- Steven Gladstone New York Based Cinematographer Gladstone films Blog - http://indiekicker.reelgrok.com/ http://www.blakehousemovie.com http://www.gladstonefilms.com 917-886-5858 _______________________________________________ FrameWorks mailing list [email protected] https://mailman-mail5.webfaction.com/listinfo/frameworks
