The basic exposure rule for an average scene taken on a bright, sunny day is to use f/16 at a shutter speed equivalent to one over the ISO setting; that is, f/16 at 1/100 sec (or the nearest equivalent, 1/125) at ISO 100, etc. In other words, the shutter speed will vary according to the ISO you are using. http://mamiya35collectors.com/sunny16.htm
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