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EV Calculations



 
 
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  #1  
Old March 23rd 17, 02:54 PM posted to rec.photo.digital
SteveGG
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Posts: 7
Default 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 ) .
  #2  
Old March 23rd 17, 03:33 PM posted to rec.photo.digital
Whiskers
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Posts: 188
Default 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

--
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-- Whiskers
-- ~~~~~~~~~~
  #3  
Old March 23rd 17, 04:32 PM posted to rec.photo.digital
SteveGG
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Posts: 7
Default EV Calculations

Hadn't seen that.

Very good material !

Nice graphics and aggrees with my formula.

Thanks ...
  #4  
Old March 23rd 17, 04:34 PM posted to rec.photo.digital
SteveGG
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Posts: 7
Default EV Calculations

agrees
  #5  
Old March 23rd 17, 04:41 PM posted to rec.photo.digital
android
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Posts: 3,854
Default 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  
Old March 24th 17, 02:04 AM posted to rec.photo.digital
Whiskers
external usenet poster
 
Posts: 188
Default EV Calculations

On 2017-03-23, SteveGG wrote:
agrees


Yes, that too )

--
-- ^^^^^^^^^^
-- Whiskers
-- ~~~~~~~~~~
 




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