SP645
Mid-Red/NIR Blocking Filter

The single substrate, hard-coated SP645 filter blocks much of the red and near infrared (IR) portions of the spectrum. Substrate glass is 1mm thick, as it is often the filter of choice for camera manufacturers for assembly immediately above a CCD or CMOS sensor.

Depending on the spectral response of a given camera, many camera manufacturers feel they achieve a much better color balance when they are able to not only block the IR, but much of the red portion of the visible spectrum as well.

Compared with standard IR blocking filters offered by all other companies, IR blocking of the SP645 is far superior – averaging better than 99.99% from 675-900nm – and the transition at the cut-off point is particularly steep, making the SP645 filter an excellent value. We know of NO other filter manufacturer offering camera filters with this sort of performance.

Certain machine vision filters can also be used to block the bright glow of hot metals, glass and other material. Shortpass filters allow light up to a specific wavelength to pass through while blocking all light at higher wavelengths. This useful feature permits, for example, the viewing of hot rolled steel to see certain temperature areas while not blinding the system from the brighter, hotter areas.

See SP510, SP570, SP585, SP625, SP645, SP700 and SP730

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 380-640nm
Reflects 650-1065nm

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

37.61
29.94
73.77
80.45
34.02
15.86
11.04
3.42
1.30
0.70

0.46
0.38
0.27
0.26
0.15
0.07
0.05
0.19
0.08
0.14

0.02
0.03
0.05
0.01
0.00
0.00
0.00
0.00
0.00
0.01

0.00
0.01
0.00
0.01
0.01
0.01
0.01
0.01
0.01
0.00

0.00
0.01
0.07
0.23
1.56

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

13.73
81.66
92.15
93.09
93.75
94.00
93.98
92.63
91.55
93.72

93.05
93.15
93.85
91.95
94.04
92.27
93.15
92.30
83.19
84.77

92.35
91.83
92.29
91.66
88.44
65.70
73.06
63.56
34.83
0.72

0.00
0.02
0.00
0.02
0.04
0.00
0.00
0.00
0.00
0.00

0.00
0.00
0.00
0.00
0.00