Remember, 1 stop is double (or half) the light. 4 0ifference equals
0.08 stop, less that 1/10 of a stop, less than the variation between
lenses and diaphrams from production variations, possibly even from
temperture variation.
Moose
Roger Wesson wrote:
If all else was equal the 5 element would be a little bit brighter but
not enough to notice. Say each element transmits 980f the light
passing through. Then the fraction of light making it right through to
the back is 0.98 raised to the power of the number of elements: 0.87 for
7 elements and 0.90 for 5 elements. So the 5 element only lets in 4%
more light than the 7 element - definitely too small to be noticable in
the viewfinder.
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