Quote Originally Posted by Lee L View Post
I usually make up a small spreadsheet to create a table showing standard meter exposure time readouts and the corresponding corrected exposure times using a formula of this form. I print out and carry the table in my camera bag and use it to determine exposure times corrected for reciprocity. A number of shots made at various corrected exposure times will quickly tell you if the corrections are suitable.

If you prefer to use a Schwarzschild or modified Schwarzschild formula, the approximate Schwarzschild exponent for the adjustments given is 0.90.

yeah Lee.. I got your chart you made on the CHS Art 100 off this post: http://www.apug.org/forums/forum37/6...tml#post874261

I believe the curves will be the same for iso 25 as it is for 100. What do you think?