Actually, they are log-base-10, or "D". A 1.0D has 10x attenuation, a 2.0D has 100x attenuation, an nD is 10n; in this case 0.6D = 100.6 = 3.98x. Stops are log-2, i.e. 4 stops is 24 = 16x attenuation.
To convert from D to stops, you do this:
stops = log2(10D)
stops = D / log10(2) = D / 0.301
in this case, stops = 0.6 / 0.301 = 1.993 = 2 stops. This is what you'd expect from above, because 3.98x attenuation is pretty much 4x, and 4x is 2 stops.
every 0.3 equal 1 stop,because the log of 2 is roughly 0.3;photomath is soo much fun.I wish they would have used it in highschool;then,i'm sure I would have paid much better attention.
every 0.3 equal 1 stop,because the log of 2 is roughly 0.3;photomath is soo much fun.I wish they would have used it in highschool;then,i'm sure I would have paid much better attention.