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EV Calculations
Exposure Value ( EV ) is a good measure of exposure and
is a function of shutter speed number ( s ) and apperture number ( f ) . It is an inverse relationship, so higher EVs mean less exposure. Mathematically, 2 raised to the power ( EV ) = s x f x f . Example : 1/60 second ( s = 60 ), at F/8 ( f = 8 ) , then EV = Log ( 60 x 8 x 8 ) / Log ( 2 ) = 11.9 ( approximately ) . |
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EV Calculations
On 2017-03-23, SteveGG wrote:
Exposure Value ( EV ) is a good measure of exposure and is a function of shutter speed number ( s ) and apperture number ( f ) . It is an inverse relationship, so higher EVs mean less exposure. Mathematically, 2 raised to the power ( EV ) = s x f x f . Example : 1/60 second ( s = 60 ), at F/8 ( f = 8 ) , then EV = Log ( 60 x 8 x 8 ) / Log ( 2 ) = 11.9 ( approximately ) . See https://en.wikipedia.org/wiki/Exposure_value -- -- ^^^^^^^^^^ -- Whiskers -- ~~~~~~~~~~ |
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EV Calculations
Hadn't seen that.
Very good material ! Nice graphics and aggrees with my formula. Thanks ... |
#4
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EV Calculations
agrees
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#5
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EV Calculations
In article ,
SteveGG wrote: Exposure Value ( EV ) is a good measure of exposure and is a function of shutter speed number ( s ) and apperture number ( f ) . It is an inverse relationship, so higher EVs mean less exposure. Mathematically, 2 raised to the power ( EV ) = s x f x f . Example : 1/60 second ( s = 60 ), at F/8 ( f = 8 ) , then EV = Log ( 60 x 8 x 8 ) / Log ( 2 ) = 11.9 ( approximately ) . For those that are math challenged: http://www.sekonic.com/sweden/suppor...rsionchart.asp x -- teleportation kills |
#6
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EV Calculations
On 2017-03-23, SteveGG wrote:
agrees Yes, that too ) -- -- ^^^^^^^^^^ -- Whiskers -- ~~~~~~~~~~ |
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