Where do Standard Shutter speeds come from?

link

xpatUSA
Members 1563 posts

Aug. 30, 2026, 4:18 p.m. Aug. 30, 2026, 4:18 p.m.
link

Maybe here? en.wikipedia.org/wiki/Renard_series

Wiki has written:

Each of the Renard sequences can be reduced to a subset by taking every nth value in a series, which is designated by adding the number n after a slash. For example, "R10″/3 (1…1000)" designates a series consisting of every third value in the R″10 series from 1 to 1000, that is, 1, 2, 4, 8, 15, 30, 60, 120, 250, 500, 1000

"R10"/3 (2 ... 8000) in white numbers

L-398A dials.jpg
JPG, 523.9 KB, uploaded by xpatUSA on Aug. 30, 2026.