PW TT5 and TT1 vs Nikon CLS accuracy

I have three Nikon FlexTT5's and use them with the Nikon SB-900 and SB-910 flash units along with an AC3 Zone controller. Normally I have all my flash units set in manual mode at various power settings and adjust them by taking readings from a Sekonic L-758DR light meter. I have tested these flash units in TTL mode fired directly from the top of the camera and from one of the FlexTT5's and according to the L-758DR there is no measurable difference when tested at the same exact distance. The largest variation I have seen during testing was one-tenth according to the meter, so based upon the unscientific testing I have done I do not see any issues using TTL or TTL BL on one of the FlexTT5 units.

Frank

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Dodging and burning are steps to take care of mistakes God made in establishing tonal relationships. ~ Ansel Adams