F-stop reduction	Optical Density	Filter Factor	Name	1/8000	1/4000	1/2000	1/1000	1/500	1/250	1/125	1/60	1/30	1/15	1/8	1/4	1/2	1	2	4	8	15	30	1m
1	0.3	2	1-Stop ND0.3/ND2	1/4000	1/2000	1/1000	1/500	1/250	1/125	1/60	1/30	1/15	1/8	1/4	1/2	1	2	4	8	15	30	1m	2m
1.3	0.4	2.5	1 1/3-Stop Singh-Ray LB Polarizer	1/3200	1/1600	1/800	1/400	1/200	1/100	1/50	1/25	1/13	1/6	1/3	0.6	1.3	2.5	5	10	20	40	1m 15s	2.5m
1.6	0.5	3	1 2/3-Stop Standard Polarizer	1/2500	1/1250	1/640	1/320	1/160	1/80	1/40	1/20	1/10	1/5	0.4	0.8	1.6	3.2	6	12	24	48	1m 36s	3m 12s
2	0.6	4	2-Stop ND0.6/ND4	1/2000	1/1000	1/500	1/250	1/125	1/60	1/30	1/15	1/8	1/4	1/2	1	2	4	8	15	30	1m	2m	4m
3	0.9	8	3-Stop ND0.9/ND8	1/1000	1/500	1/250	1/125	1/60	1/30	1/15	1/8	1/4	1/2	1	2	4	8	15	30	1m	2m	4m	8m
4	1.2	16	4-Stop ND1.2 Singh-Ray	1/500	1/250	1/125	1/60	1/30	1/15	1/8	1/4	1/2	1	2	4	8	15	30	1m	2m	4m	8m	15m
5	1.5	32	5-Stop Singh-Ray Mor-Slo	1/250	1/125	1/60	1/30	1/15	1/8	1/4	1/2	1	2	4	8	15	30	1m	2m	4m	8m	15m	30m
6	1.8	64	6-Stop B+W 106	1/125	1/60	1/30	1/15	1/8	1/4	1/2	1	2	4	8	15	30	1m	2m	4m	8m	15m	30m	1h
7	2.1	128	7-Stop Singh-Ray Vari-N	1/60	1/30	1/15	1/8	1/4	1/2	1	2	4	8	15	30	1m	2m	4m	8m	15m	30m	1h	2h
8	2.4	256	8-Stop Singh-Ray Vari-N	1/30	1/15	1/8	1/4	1/2	1	2	4	8	15	30	1m	2m	4m	8m	15m	30m	1h	2h	4h
9	2.7	512	9-Stop Hoya NDx400	1/15	1/8	1/4	1/2	1	2	4	8	15	30	1m	2m	4m	8m	15m	30m	1h	2h	4h	8h
10	3	1024	10-Stop B+W 110/Lee BigStopper	1/8	1/4	1/2	1	2	4	8	15	30	1m	2m	4m	8m	15m	30m	1h	2h	4h	8h	16h
11	3.3	2048	n/a	1/4	1/2	1	2	4	8	15	30	1m	2m	4m	8m	15m	30m	1h	2h	4h	8h	16h	1d 8h
12	3.6	4096	n/a	1/2	1	2	4	8	15	30	1m	2m	4m	8m	15m	30m	1h	2h	4h	8h	16h	1d 8h	2d 16h
13	3.9	8192	13-Stop Cokin NDX	1	2	4	8	15	30	1m	2m	4m	8m	15m	30m	1h	2h	4h	8h	16h	1d 8h	2d 16h	5d 8h
14	3.6	16384	n/a	2	4	8	15	30	1m	2m	4m	8m	15m	30m	1h	2h	4h	8h	16h	1d 8h	2d 16h	5d 8h	10d 16h
15	4.5	32768	15-Stop Singh-Ray Mor-Slo	4	8	15	30	1m	2m	4m	8m	15m	30m	1h	2h	4h	8h	16h	1d 8h	2d 16h	5d 8h	10d 16h	21d 8h
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