Hi Windsor:
> I am never quite sure, since FStops are not
> linear or arithmetic, how much more light I am letting in wide open than
> the nearest true FStop.
Remember these 1/3 stop increments:
16, 18, 20 and
22, 25, 28
and you can calculate the others by simple doubling or halving of the numbers.
To save the trouble, here they are:
1, 1.1, 1.2
1.4, 1.6, 1.8
2, 2.2, 2.5
2.8, 3.2, 3.5
4, 4.5, 5
5.6, 6.3, 7
8, 9, 10
11, 12.5, 14
16, 18, 20
22, 25, 28
32, 36, 40
45, 48
There is some rounding involved, esp. f/8 which is really f/7.7
Gary Reese
Las Vegas, NV
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