BP660
Dark Red Bandpass Filter

Recommended for use with dark red LEDs

We recommended the BP660 for use with 650-680nm LED and laser diode lighting. Because of its ample bandwidth and excellent in-band transmission, it works very well for all camera-related applications in this range. We currently provide more BP660 single substrate, hard-coated filters than any other filter in our line.

Color longpass filters, sometimes referred to as "sharp cut" filters, are often suggested by others for creating increased contrast and resolution. They will block UV and shorter visible wavelengths but still pass all longer wavelengths. Except in those few cases where an IR-blocking or other shortpass filter is incorporated into the camera or sensor, MidOpt will for the most part recommend the use of one of our broad color bandpass filters (such as the BP660) over these "sharp cut" longpass filters alone. The results are consistently improved contrast in most inspection applications over the long term.

Example:

(left) Kale leaves under white light and through a monochrome camera.
(center) Photographic longpass filter provides some contrast.
(right) MidOpt BP660 creates improved contrast.

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 635-690nm
Absorbs 200-630nm
Reflects 695-1100nm

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

20.80
6.72
2.76
1.45
0.85
0.67
0.62
0.65
0.89
1.48

1.65
0.66
0.32
0.17
0.15
0.15
0.17
0.22
0.44
1.95

2.10
0.62
0.34
0.27
0.33
0.62
1.15
1.50
0.64
0.37

0.33
0.49
0.65
0.93
1.12
1.49
2.86
3.13
4.49
11.80

33.02
52.29
78.07
94.81
96.25

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

92.78
78.79
44.78
6.15
0.38
0.07
0.03
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