I've read Phil Davis' Beyond the Zone System a number of times, but was struck the other week with something I don't remember ever reading. It's on page 95 of the fourth edition. "The amount of flare light that's present in the camera and its ultimate effect on the image are both unmeasurable. One thing is certain, though: There will be flare, and it will affect the image. At this point, we can only guess at the amount of adjustment necessary, so we'll assume a typical value and make the compensation by increasing the SI value by 10% For example, if your SI value is 0.9, multiply it by 1.1 (110%) to get 0.99, and add that to 0.06 (the IDmin value) to get 1.05. Then mark each curve at that level: 1.05 over B+F." My question to those who use BTZS is: Have you noticed this section and do you make this adjustment?