Originally Posted by Sparky
why? when i can easily calculate the exposure based on the bellows draw (i always do it that way) - new F.L. squared over nominal FL squared...
But is it not more likely that you could make an error in your calculations as opposed to reading the luminance at the focal plane? Or even do this to check you are correct?
“The contemplation of things as they are, without error or confusion, without substitution or imposture, is in itself a nobler thing than a whole harvest of invention”