He probably used this method when shooting portraits, but his main technique for outdoor scenes, etc, is what he called MPD (Maximum Printable Density.) His theory was that since Zone VIII is the maximum negative density that can realistically be printed, meter for Zone VIII, set shutter speed and aperture accordingly, expose, and develop normally. He rarely, if ever, did minus development and if he felt he needed expanded development, he'd still shoot a "normal" neg, then expose another sheet for an N + 1 1/2 development.
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