hi i've got an Zero Image pinhole camera and i've got a question concerning sth called 'reciprocal failure'. In a instruction added to a camera it's written that it means that i need to multiply the speed by 2 when it's 1-2seconds, by 4 when it's 2-4...by 12 when it's more then 10 or sth like this. anyway it's written in a very simplified way so i'd like to know some details. the aperture in this camera is 138. thanks. karl
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