Archived posting to the Leica Users Group, 1998/01/21[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]
> well, I know the light is measured from the white spot. This spot has - > according to the M6 Manual a height of 12mm. That is exactly HALF of the > height of the whole frame. However it is stated in the same manual, that the > area covered by the meter is TWO THIRDS of the height. So here is my question: > > Where do they gain these additional measuring area? > > I would understand if the mesured field in the scene would cover the same > proportion of the whole area covered by the lens as does the white spot from > the whole curtain. > > Any suggestions? > The difference could be caused by the fact that the white dot is not at the film plane but ahead of it. So light hitting the white dot spreads to an area bigger that the white dot when the shutter opens. This seems to imply that the metering area depends on focal length and f-stop.