Giving a very small, even, overall exposure to the film immediately before or after the film is exposed in the camera gate is a method of increasing effective film speed, reducing contrast, putting more information into the shadow areas and, if desired in the case of color film, of tinting the shadows without affecting the highlights. It is a technique which is as old as photography itself.
The PANAVISION PANAFLASHER unit fits onto whichever PANAFLEX or PANASTAR magazine port is not currently in use. It makes no difference if the film is flashed just before or just after the principal exposure.
The effect of flashing is most pronounced in the shadow areas. It has little or no effect in the middle tones or the white areas of the picture. ...