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

 

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