BP365
Blacklite/UV 'A' Bandpass Filter

Blocks visible light while passing UV

The BP365 UV Blacklite filter is particularly well suited for use with 365nm LEDs or UV fluorescent black lights.

Centered at 365nm, the single substrate, hard-coated MidOpt BP365 features higher transmission than might normally be expected in this range. Generally, UV bandpass filters tend to have somewhat lower peak transmission, are more expensive and may have some amount of visible light "leaking" through them. This is not the case with the BP365. Although a small amount of deep-blue/near-UV light does leak through, it is usually considered insignificant.

Blocks the metal halide source

Often this filter may be more appropriate for filtering a UV light source itself, such as metal halide lighting, in which case a custom filter may be requested, either mounted or unmounted. In these cases, sizes ranging from a few millimeters to over 600mm in diameter can be produced in a matter of days. Please contact us for a quotation if you have such a custom requirement.

Download Excel Spreadsheet with data and curve for this filter.

Examples of filter effectiveness.

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 315-390nm, 815nm and above
Reflects visible light 400-805nm and some 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

69.41
74.18
81.03
85.01
82.24
75.06
68.84
66.77
68.83
72.41

73.56
71.30
70.00
74.56
85.27
90.39
76.67
58.54
50.95
56.38

74.24
85.69
73.10
59.69
63.00
60.00
41.05
37.75
66.10
38.12

7.92
3.77
2.21
0.60
0.16
0.07
0.05
0.05
0.08
0.03

0.00
0.00
0.02
0.07
0.02

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
0.00
0.03
0.17
0.05
0.03
0.05
0.00
0.00
0.00

0.00
0.01
0.00
0.01
0.01
0.00
0.03
0.31
0.03
0.05

0.06
0.08
0.09
0.31
0.84
6.42
40.14
90.97
82.43
81.66

85.02
77.54
70.45
52.10
34.50
8.63
0.00
0.00
0.00
0.00

0.00
0.00
0.00
0.00
0.00