Posted by Bob Stoddard on October 27, 2000 at 19:15:08:
In Reply to: Re: old timer tricks posted by Dennis Lee on October 27, 2000 at 18:43:55:You either have to be old or into camera history and collecting (I qualify both ways!) to know what these were, but basically they measured the brightness of the illumination from a scene by passing it through a scale of graduated density, with a number beside each density segment. You got your reading of illumination intensity by noting the highest number that you could read with the available light, i.e., the point at which visual extinction occurred. They were usually very compact and inexpensive, with nothing to break down, but they weren't noted for very good accuracy, since different individuals could disagree as to where the visual extinction point occurred. RKS