Archived posting to the Leica Users Group, 1998/01/22
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]>Emanuel wrote: ><<<This is how you do multiple exposures with M-cameras. It is easier to do >than it is to explain..>>>>> >Ted wrote: >Using an ISO 100 film set your meter for example 400. You then make 8 >exposures one right after the other on the same frame. Then advance to the >next frame and repeat say for 800, this equates to 16 exposures on the same >frame. I'm a bit slow on the uptake ... sorry. I don't get it, but I've done lots of double exposures before, rating the film at twice the speed but processing normally. I have 100 ISO film, right? I set my meter at 400. The camera now thinks my film is 4 times faster than it actually is. (i.e., I might shoot at something like 1/125 @ f/8 instead of 1/125 @ f/4) Each exposure on the frame then gets a 2-stop underexposure. So don't I need to make 4 exposures on the frame instead of 8? Then at ISO 800, I'd do 8 exposures instead of 16. What is the purpose of doubling the number of exposures? Is there some cumulative reciprocity effect happening here? - -GH