Proper Blind Exposure with a Gray Card

Started Nov 12, 2012 | Discussions thread
JDinOregon
New MemberPosts: 5
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Re: steephill, sjgcit, gl2k
In reply to Jack Hogan, Nov 13, 2012

After staring at the DXO Ssat equation for a while I come up with;

Ssat=(78/q)*(N^^2/t)*1/Lsat   =  (78/q) *(L/k)*Ssat/Lsat  from  N^^2/t  = L*Ssat/k

thus

Lsat/L=78/(k*q)  or Lsat is 3 stops higher than the metered L value for q=pi/4.

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