It has to do with the difference between the tones on a test strip.
I believe that test strips produced with f-stop times to 1/10 of a second, will be visibly more evenly and equally spaced, than test strips produced to f-stop times rounded up/down to the nearest second.
It also begs the question that if the unit of a tenth of a second was redundant in practice, then why include them in the table in the first place? Why not just round off all of the numbers above 10 seconds, up or down, to the nearest second?
Hopefully that's a bit clearer?
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MartyNL
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