BP800
IR Bandpass Filter

Recommended for use with near-infrared lighting

The single substrate, hard-coated BP800 filter is a very broad absorptive bandpass filter that cuts on sharply at 725nm (50% point), peaks at about 800nm, and cuts off very gradually over a range from 900 to 1200nm. In fact, given that this cut-off range is largely beyond the range of sensitivity of most CCD cameras, for most machine vision applications it is probably best to think of this as a 725nm Longpass Filter. It can be used in conjunction with several commonly used LED and laser diode wavelengths.

Two other uses for this filters are:

a) When used with infrared vidicon or InGaAs cameras with their sensitivities typically out to 1800nm or 2200nm, the BP800 acts as a bandpass filter.

b) Whenever a special application arises calling for a very thin infrared filter – thickness 1.5mm and below; e.g. for mounting above a sensor – this is the filter of choice. The BP800 will generally not transmit visible light even when thinned to less than 1mm.

This is an ionically colored filter glass, whereas all other visible blocking/infrared passing filter glasses are colloidally colored. Colloidally colored IR filter glass will pass significant amounts of visible light when made thinner.

Example:

Full-color photo, no filters used.

Deep IR image using BP800 straight from the camera.

Examples of other filters' effectiveness.

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 730-1030nm
Absorbs 720nm and below, 1050nm and above

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

17.91
22.18
26.80
31.71
36.82
42.04
47.18
52.09
56.67
61.05

65.14
68.81
72.16
75.18
77.85
80.16
82.32
84.06
85.68
87.06

88.28
89.49
90.12
90.79
91.51
91.72
92.07
92.31
92.37
92.46

92.46
92.41
92.13
91.45
89.65
85.39
75.51
56.73
29.65
7.24

0.38
0.00
0.00
0.00
0.00

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
0.00
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
0.00
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