Archived posting to the Leica Users Group, 1998/07/08
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I recently ran an informal test on some film I was trying for the first time (Sensia II). I rated the film at different aperture/shutter combos, always at the same exposure. For example, if the exposure from my incident meter was 1/250 @ f/8, I would also try 1/500 @ f/5.6, 1/1000 @ f/4, and 1/125 @ f/11. This was on my M6, by the way. I found that as the apertures got smaller (towards f/16), the slides were slightly darker, and as the aperture enlarged the slides were slightly lighter. I have noticed this before, but didn't think much of it since the decrease or increase of light is only 1/4-1/3 stop per f-stop. Shouldn't a slide exposed at 1/250 @ f/8 look EXACTLY like a slide exposed at 1/60 @ f/16 or 1/1000 @ f/4 ?? I thought the only thing that would change would be motion-freezing ability (the shutter speed) and DOF (the aperture). Does this signify a probem with my M6, or is this a phenomenon well-known by everyone but me? Francesco