T4105 Transmission 41-Step Specifications
Step       Target       Tolerance    %Light Transmission    *% Light Transmission *
1 .05 .02 89.13 100
2 .10 .02 79.43 89
3 .15 .02 70.79 80
4 .20 .02 63.10 71
5 .25 .02 56.23 64
6 .30 .02 50.12 56
7 .35 .02 44.67 50
8 .40 .02 39.81 45
9 .45 .02 35.48 40.5
10 .50 .02 31.62 36
11 .55 .02 28.18 32
12 .60 .02 25.15 28.25
13 .65 .03 22.39 25
14 .70 .03 19.95 22.5
15 .75 .03 17.78 20
16 .80 .03 15.85 18
17 .85 .03 14.13 16
18 .90 .03 12.59 14
19 .95 .04 11.22 12.5
20 1.00 .04 10.00 11.2
21 1.05 .04 8.913 10
22 1.10 .04 7.943 9
23 1.15 .05 7.079 8
24 1.20 .05 6.310 7
25 1.25 .05 5.623 6.25
26 1.30 .05 5.012 5.6
27 1.35 .05 4.467 5
28 1.40 .05 3.981 4.5
29 1.45 .05 3.548 4
30 1.50 .05 3.162 3.5
31 1.55 .05 2.818 3.13
32 1.60 .05 2.512 2.8
33 1.65 .05 2.239 2.5
34 1.70 .05 1.995 2.25
35 1.75 .05 1.778 2
36 1.80 .05 1.585 1.75
37 1.85 .05 1.413 1.57
38 1.90 .05 1.259 1.4
39 1.95 .05 1.122 1.25
40 2.00 .05 1.00 1.12
41 2.05 .05 .8913 1

 

*.05 film base is assumed to have 100% transmission*