BP324
UV Bandpass Filter

Blocks visible light while passing UV

BP324 single substrate filters have broad spectral bandwidth in the ultraviolet, while effectively blocking visible and infrared light. These filters are particularly useful in true UV imaging applications, where blocking of these longer wavelengths is essential, and the camera employed is often designed to be particularly sensitive in the ultraviolet. Both the UV ‘A” and UV ‘B’ portions of the ultraviolet spectrum are passed, while the UV ‘C’ portion is blocked. Aside from mounted versions that are placed in front of the camera lens, different configurations can also be supplied for mounting in front of low power ultraviolet LED light sources for blocking visible output.

For other types of higher wattage, high-energy UV light sources, we recommend our BP365 filter.

Example:

(left) Car looks like new and seller claimed there had been no damage.
(right) The view in the ultraviolet shows that the car had been repainted.

More examples

Download Excel Spreadsheet with data and curve for this filter.

Standard Threaded Mounts:
We offer standard filter sizes from stock – 22.5mm to 62mm – for same- or next-day shipping. Larger filters – 67mm to 105mm – are made to order and are normally not returnable.

Click here for PDF drawing of standard mounts

Slip Mounts:
If your lens does not have threads for mounting a filter, Slip Mount adapters are available. Slip Mounts can attach a regular filter to a lens or attach a very large filter to accommodate a wide angle lens. Please call to order Slip Mount adapters.

C-Mounts:
3mm thick threaded mount for adding a filter between lens and camera
Click here for PDF drawing of c-mounts

Transmission chart (typical)
Passes (UV) 270-375nm and (NIR) 690-750nm
Absorbs visible and most IR

1100
1090
1080
1070
1060
1050
1040
1030
1020
1010

1000
990
980
970
960
950
940
930
920
910

900
890
880
870
860
850
840
830
820
810

800
790
780
770
760
750
740
730
720
710

700
690
680
670
660

3.75
3.78
3.78
3.75
3.53
3.28
3.11
2.80
2.40
2.07

1.73
1.47
1.16
0.88
0.74
0.66
0.61
0.54
0.52
0.59

0.42
0.42
0.45
0.44
0.54
0.57
0.70
0.88
1.13
1.52

2.10
3.02
4.39
6.48
9.44
13.39
18.40
23.91
28.08
27.36

21.88
14.15
5.46
1.01
0.07

650
640
630
620
610
600
590
580
570
560

550
540
530
520
510
500
490
480
470
460

450
440
430
420
410
400
390
380
370
360

350
340
330
320
310
300
290
280
270
260

250
240
230
220
210

0.00
0.01
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00

0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00

0.00
0.00
0.00
0.00
0.02
1.08
12.73
46.70
72.89
83.41

87.02
88.32
88.32
87.68
86.30
83.97
79.00
69.22
52.40
29.71

7.53
0.17
0.00
0.00
0.00