Somewhere over the years the Sunny Sixteen Rule fell victim to the concept that it was a Universal Law -- that all cameras, lenses and meters were identical and perfect examples of uniformity.
I never paired a camera, lens, meter, film and developer for any important purpose without first producing a test strip to 'proof' the system. Sometimes it required one or more 36-frame rolls of film to cover all extremes, others it may have only involved a hand-loaded short roll of 10 frames of a specific subject. If significant calibration errors were present correcting the exposure by using a 'false' ASA/ISO setting solved the problem whether for metering or a mental guess-timate.
Calibration used to be a real PITA with film in both time and expense. Today the use of free digital film and instant review with the aid of the histogram makes it a breeze. May I suggest experimenting with a DSLR to develop a cheap, real-time personal flow before undertaking a film calibration. Keep notes. Use a variable POL filter to induce an intentional 'calibration error' to help better understand the process.
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