On 11 November 2014 I received a new Sekonic L-308S exposure meter, mainly for flash exposures. It works well, but it has
a strange way of displaying apertures: instead of displaying them directly, the most
accurate mode displays them as base aperture and a decimal fraction.
I assume that this isn't Sekonic's fault. Presumably it's the way that studio photographers
like it, and I could even understand that it makes a little sense: that way you can compare
exposures across different base apertures. For example, it's easier to see that
f/8.1 and f/5.6.3 are 0.8 stop apart than if they're referred to as f/8.28 and
f/6.21. In any case, this table converts them to real apertures.
|
|
0 |
|
1 |
|
2 |
|
3 |
|
4 |
|
5 |
|
6 |
|
7 |
|
8 |
|
9 |
| 1.0 |
|
1.00 |
|
1.04 |
|
1.07 |
|
1.11 |
|
1.15 |
|
1.19 |
|
1.23 |
|
1.27 |
|
1.32 |
|
1.37 |
| 1.4 |
|
1.40 |
|
1.45 |
|
1.50 |
|
1.55 |
|
1.61 |
|
1.66 |
|
1.72 |
|
1.78 |
|
1.85 |
|
1.91 |
| 2.0 |
|
2.00 |
|
2.07 |
|
2.14 |
|
2.22 |
|
2.30 |
|
2.38 |
|
2.46 |
|
2.55 |
|
2.64 |
|
2.73 |
| 2.8 |
|
2.80 |
|
2.90 |
|
3.00 |
|
3.11 |
|
3.22 |
|
3.33 |
|
3.45 |
|
3.57 |
|
3.69 |
|
3.82 |
| 4.0 |
|
4.00 |
|
4.14 |
|
4.29 |
|
4.44 |
|
4.59 |
|
4.76 |
|
4.92 |
|
5.10 |
|
5.28 |
|
5.46 |
| 5.6 |
|
5.60 |
|
5.80 |
|
6.00 |
|
6.21 |
|
6.43 |
|
6.66 |
|
6.89 |
|
7.14 |
|
7.39 |
|
7.65 |
| 8.0 |
|
8.00 |
|
8.28 |
|
8.57 |
|
8.88 |
|
9.19 |
|
9.51 |
|
9.85 |
|
10.20 |
|
10.56 |
|
10.93 |
| 11.0 |
|
11.00 |
|
11.39 |
|
11.79 |
|
12.21 |
|
12.64 |
|
13.08 |
|
13.54 |
|
14.02 |
|
14.51 |
|
15.03 |
| 16.0 |
|
16.00 |
|
16.56 |
|
17.15 |
|
17.75 |
|
18.38 |
|
19.03 |
|
19.70 |
|
20.39 |
|
21.11 |
|
21.86 |
| 22.0 |
|
22.00 |
|
22.78 |
|
23.58 |
|
24.41 |
|
25.27 |
|
26.16 |
|
27.09 |
|
28.04 |
|
29.03 |
|
30.05 |
| 32.0 |
|
32.00 |
|
33.13 |
|
34.30 |
|
35.51 |
|
36.76 |
|
38.05 |
|
39.40 |
|
40.79 |
|
42.22 |
|
43.71 |
|
