COLOR FILTER GLASS
Neutral Density Filters
Thickness: (2.5) mm
Refractive Index (n) | Absorption coefficient (K) | Reflection coefficen
Bubble Class
λnm
400
500
600
700
800
900
1000
n
1.538
1.527
1.521
1.518
1.515
1.514
1.513
K
3.1E-05
3.2E-05
3.9E-05
3.9E-05
4.9E-05
6.5E-05
8.0E-05
P
0.914
0.917
0.918
0.919
0.919
0.920
0.920
3
Properties
Chemical
DW
Thermal
Tg
DA
1
1
535
Ts
α -30/70
595
58
Mechanical
α 100/300
HK
68
530
Color Specification
0.418
16
569
Pe
Tav (%)
1
15 ±2
7
OD
1
0.82 ±0.1
0.315
0.336
16
562
7
0.317
0.348
16
561
7
3
1) Average Transmittance at 400nm - 700nm
1.00
80
0.80
60
0.60
40
0.40
20
0.20
200
250
300
350
400
450
500
550
600
650
7 00
7 50
Wavelength(nm)
800
850
9 00
9 50
1000
1050
1100
1150
0.00
1200
1.00
80
0.80
60
0.60
40
0.40
20
0.20
(%)
100
0
200
600
1000
1400
1800
2200
2600
Wavelength (nm)
Transmittance (%)
204
3000
3400
Internal Transmittance
3800
4200
4600
Transmittance
Internal
λd
Y
100
0
Transmittance
2.43
0.00
5000
Transmittance
Internal
(%)
Transmittance
ND15
y
0.447
C
D65
100
Tolerance of Transmittance (T)
x
A
FA
Others
d
Neutral Density Filteres
Initial Value: 200λnm - 0.00T
λnm
T
λnm
T
λnm
T
λnm
T
λnm
T
λnm
T
210
0.0
610
14.8
1010
9.4
1410
15.4
1810
26.9
3050
36.1
220
0.0
620
15.2
1020
9.2
1420
16.0
1820
27.1
3100
33.0
230
0.0
630
15.3
1030
9.1
1430
16.5
1830
27.3
3150
24.9
240
0.0
640
15.1
1040
8.9
1440
17.0
1840
27.5
3200
15.1
250
0.0
650
14.9
1050
8.8
1450
17.3
1850
27.7
3250
8.7
260
0.0
660
15.0
1060
8.7
1460
17.8
1860
27.9
3300
5.4
270
0.0
670
15.5
1070
8.6
1470
18.2
1870
28.1
3350
3.8
280
0.0
680
16.7
1080
8.5
1480
18.7
1880
28.3
3400
3.1
290
0.0
690
18.2
1090
8.5
1490
19.1
1890
28.5
3450
2.9
300
0.0
700
19.5
1100
8.4
1500
19.6
1900
28.8
3500
2.7
310
0.0
710
20.3
1110
8.4
1510
20.0
1910
29.0
3550
2.7
320
0.0
720
20.5
1120
8.3
1520
20.4
1920
29.2
3600
2.7
330
0.0
730
20.3
1130
8.3
1530
20.8
1930
29.4
3650
2.8
340
0.0
740
19.8
1140
8.3
1540
21.2
1940
29.6
3700
2.8
350
0.0
750
19.2
1150
8.3
1550
21.5
1950
29.9
3750
2.9
360
0.6
760
18.6
1160
8.3
1560
21.8
1960
30.1
3800
3.0
370
1.8
770
17.8
1170
8.4
1570
22.2
1970
30.3
3850
3.1
380
1.8
780
17.1
1180
8.4
1580
22.5
1980
30.5
3900
3.3
390
6.6
790
16.5
1190
8.5
1590
22.8
1990
30.7
3950
3.4
400
10.5
800
15.9
1200
8.6
1600
23.1
2000
30.9
4000
3.5
410
10.6
810
15.4
1210
8.7
1610
23.4
2050
31.9
4050
3.6
420
10.9
820
14.9
1220
8.9
1620
23.6
2100
32.8
4100
3.7
430
12.0
830
14.4
1230
9.0
1630
23.9
2150
33.4
4150
3.9
440
12.0
840
14.0
1240
9.2
1640
24.1
2200
33.7
4200
4.0
450
13.6
850
13.6
1250
9.5
1650
24.3
2250
34.5
4250
4.1
460
15.5
860
13.3
1260
9.7
1660
24.5
2300
35.6
4300
4.2
470
15.9
870
12.9
1270
10.0
1670
24.6
2350
36.4
4350
4.4
480
15.6
880
12.6
1280
10.3
1680
24.8
2400
36.5
4400
4.5
490
15.2
890
12.3
1290
10.6
1690
25.0
2450
36.9
4450
4.6
500
15.1
900
12.0
1300
10.9
1700
25.1
2500
37.1
4500
4.7
510
15.2
910
11.7
1310
11.2
1710
25.3
2550
37.2
4550
4.8
520
15.4
920
11.4
1320
11.7
1720
25.4
2600
37.3
4600
4.9
530
15.8
930
11.1
1330
12.2
1730
25.6
2650
37.4
4650
5.0
540
16.4
940
10.9
1340
12.7
1740
25.7
2700
37.6
4700
5.1
550
16.8
950
10.6
1350
13.1
1750
25.9
2750
37.6
4750
5.2
560
17.0
960
10.4
1360
13.6
1760
26.0
2800
37.9
4800
5.3
570
16.6
970
10.2
1370
13.9
1770
26.2
2850
37.9
4850
5.4
580
15.6
980
10.0
1380
14.2
1780
26.3
2900
37.9
4900
5.5
590
14.7
990
9.8
1390
14.5
1790
26.5
2950
37.7
4950
5.6
600
14.5
1000
9.6
1400
14.9
1800
26.7
3000
37.1
5000
5.7
ND15
Transmittance (T)
205