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LP 820 HT 
Longpass Filter



Key features

  • Average transmittance 95%
  • Steep slopes
  • Ultra low reflection
  • Deep blocking / High optical density
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Schneider-Kreuznach Longpass Filter LP 820 HT

Schneider-Kreuznach longpass filters deliver high transmission and precise cutoff performance for use in industrial and machine vision applications. Thanks to their steep slopes, flat surfaces, and robust AR coatings, these filters ensure accurate results and minimal reflections even under demanding conditions. 

The Schneider-Kreuznach LP 820 HT magnetron sputtered industrial longpass filter features steep slopes and high transmission at stable cut-on wavelengths. The very flat surface makes it ideal for high end machine vision systems in factory automation. All longpass filters come with superior antireflection coating. Schneider-Kreuznach longpass filters are RoHS conform. Custom sizes are available on request.

Downloads

Technical specifications: LP 820 HT Longpass Filter

TypeStandard
Characteristicsinterference
Angle of indcident0° +/- 8°
Cut-on wavelength820 +/- 8 nm
Transmittance> 840 - 1010 nm: Tabs > 90%
> 840 - 1010 nm: Tave > 95%
Blocking< 760 nm: Tabs < 0.5%
Wavefront distortionØ >18 - 30 mm: 13/ 1(0.25) | Ø >30 - 50 mm: 13/ 1(0.30)
Parallelism1'
Glass thickness tolerance+/- 0.08mm

Filter specifications glossary

 

Specification Description
Angle of incidence (AOI) Angle between a ray of light and the surface normal to the surface it strikes
Cut-on wavelength Wavelength at which the transmission of the lower edge rises to 50%
Cut-off wavelength Wavelength at which the transmission of hhe upper edge drops to 50%
Central Wavelength (CWL) Center of the filter’s passband for which it is primarily designed
Full Width at Half Maximum (FWHM) Spectral bandwidth measured at 50% of the peak transmittance
Transmittance Ratio of transmitted light intensity to incident light intensity
Blocking Strong attenuation of light intensity over a specified wavelength range
Wavefront distortion Deviation of the transmitted wavefront from a reference plane
Parallelism Angular deviation between the two main surfaces of the filter
Glass thickness tolerance Permissible deviation from the specified substrate thickness
Wavelength range Spectral region over which the filter is designed to operate
Coating Applied layer(s) defining the filter’s spectral characteristics
Temperature range Recommended operational limits for ambient or device temperature
Glass thickness Nominal thickness of the filter glass
Optical density Attenuation measure defined as −log₁₀ of transmittance
Transmittance average Average light transmission across the specified wavelength range
Wavelength Wavelength range at which the polarizer specification applies
Transmittance, unpolarized light Ratio of transmitted to incident intensity for unpolarized light
Extinction ratio Ratio of transmitted intensity along the polarizer’s pass axis to that along its block axis
Max. size Largest standard dimension for the polarizer film
Temperature range Minimum to maximum temperature for reliable performance
Substrate Base material on which the polarizing film is applied
Thickness Nominal overall thickness of the polarizer film
Info Unless otherwise stated, all dimensions in this data sheet are in mm

 

Picture of the filter

Schneider-Kreuznach Longpass Filter LP 820 HT



Transmission of the LP 820 HT Filter


 

Transmission Data

 

Download Excel

Wavelength (nm) Transmission (%)
350 0.03
351 0.04
352 0.07
353 0.08
354 0.06
355 0.03
356 0.03
357 0.04
358 0.06
359 0.08
360 0.06
361 0.03
362 0.02
363 0.01
364 0.01
365 0.01
366 0.02
367 0.06
368 0.09
369 0.06
370 0.03
371 0.01
372 0.01
373 0.01
374 0.01
375 0.01
376 0.01
377 0.00
378 0.00
379 0.00
380 0.00
381 0.00
382 0.00
383 0.00
384 0.00
385 0.00
386 0.00
387 0.01
388 0.02
389 0.02
390 0.01
391 0.01
392 0.00
393 0.00
394 0.00
395 0.00
396 0.00
397 0.00
398 0.00
399 0.00
400 0.01
401 0.03
402 0.08
403 0.09
404 0.05
405 0.02
406 0.01
407 0.01
408 0.01
409 0.02
410 0.04
411 0.04
412 0.02
413 0.01
414 0.01
415 0.00
416 0.01
417 0.01
418 0.00
419 0.00
420 0.00
421 0.00
422 0.00
423 0.00
424 0.00
425 0.01
426 0.01
427 0.00
428 0.00
429 0.00
430 0.01
431 0.01
432 0.02
433 0.04
434 0.07
435 0.09
436 0.10
437 0.11
438 0.12
439 0.14
440 0.15
441 0.16
442 0.14
443 0.12
444 0.10
445 0.09
446 0.08
447 0.07
448 0.07
449 0.08
450 0.08
451 0.10
452 0.12
453 0.14
454 0.16
455 0.18
456 0.17
457 0.15
458 0.13
459 0.11
460 0.09
461 0.08
462 0.07
463 0.06
464 0.06
465 0.07
466 0.07
467 0.07
468 0.07
469 0.06
470 0.06
471 0.06
472 0.06
473 0.06
474 0.06
475 0.06
476 0.07
477 0.08
478 0.10
479 0.12
480 0.13
481 0.13
482 0.10
483 0.07
484 0.05
485 0.03
486 0.02
487 0.01
488 0.01
489 0.01
490 0.01
491 0.00
492 0.00
493 0.00
494 0.00
495 0.00
496 0.00
497 0.00
498 0.00
499 0.00
500 0.00
501 0.01
502 0.01
503 0.01
504 0.02
505 0.02
506 0.04
507 0.06
508 0.11
509 0.13
510 0.10
511 0.06
512 0.03
513 0.02
514 0.01
515 0.01
516 0.00
517 0.00
518 0.00
519 0.00
520 0.00
521 0.00
522 0.00
523 0.00
524 0.00
525 0.00
526 0.00
527 0.00
528 0.00
529 0.00
530 0.00
531 0.00
532 0.00
533 0.00
534 0.00
535 0.00
536 0.01
537 0.01
538 0.01
539 0.01
540 0.02
541 0.02
542 0.03
543 0.03
544 0.03
545 0.03
546 0.03
547 0.02
548 0.02
549 0.01
550 0.01
551 0.01
552 0.01
553 0.01
554 0.01
555 0.01
556 0.01
557 0.01
558 0.00
559 0.01
560 0.01
561 0.01
562 0.01
563 0.01
564 0.01
565 0.01
566 0.01
567 0.02
568 0.02
569 0.03
570 0.03
571 0.04
572 0.04
573 0.05
574 0.04
575 0.04
576 0.03
577 0.03
578 0.02
579 0.02
580 0.02
581 0.02
582 0.01
583 0.01
584 0.01
585 0.01
586 0.01
587 0.01
588 0.01
589 0.01
590 0.01
591 0.01
592 0.01
593 0.01
594 0.01
595 0.01
596 0.01
597 0.01
598 0.01
599 0.02
600 0.02
601 0.02
602 0.03
603 0.04
604 0.06
605 0.09
606 0.12
607 0.14
608 0.11
609 0.07
610 0.04
611 0.02
612 0.01
613 0.01
614 0.01
615 0.00
616 0.00
617 0.00
618 0.00
619 0.00
620 0.00
621 0.00
622 0.00
623 0.00
624 0.00
625 0.00
626 0.00
627 0.00
628 0.00
629 0.00
630 0.00
631 0.00
632 0.00
633 0.00
634 0.00
635 0.00
636 0.00
637 0.00
638 0.00
639 0.00
640 0.00
641 0.00
642 0.00
643 0.00
644 0.00
645 0.00
646 0.00
647 0.00
648 0.00
649 0.00
650 0.00
651 0.00
652 0.00
653 0.00
654 0.00
655 0.00
656 0.00
657 0.00
658 0.00
659 0.00
660 0.00
661 0.00
662 0.00
663 0.00
664 0.00
665 0.00
666 0.00
667 0.00
668 0.00
669 0.00
670 0.00
671 0.00
672 0.00
673 0.00
674 0.00
675 0.00
676 0.00
677 0.00
678 0.00
679 0.00
680 0.00
681 0.00
682 0.00
683 0.00
684 0.00
685 0.01
686 0.01
687 0.02
688 0.02
689 0.02
690 0.02
691 0.02
692 0.03
693 0.03
694 0.03
695 0.04
696 0.04
697 0.05
698 0.06
699 0.06
700 0.06
701 0.07
702 0.07
703 0.07
704 0.07
705 0.08
706 0.08
707 0.08
708 0.08
709 0.08
710 0.08
711 0.08
712 0.09
713 0.09
714 0.10
715 0.09
716 0.09
717 0.09
718 0.09
719 0.10
720 0.10
721 0.10
722 0.10
723 0.10
724 0.10
725 0.10
726 0.10
727 0.11
728 0.11
729 0.11
730 0.11
731 0.11
732 0.11
733 0.11
734 0.12
735 0.12
736 0.12
737 0.13
738 0.13
739 0.13
740 0.13
741 0.14
742 0.14
743 0.14
744 0.15
745 0.16
746 0.16
747 0.17
748 0.17
749 0.18
750 0.19
751 0.19
752 0.21
753 0.22
754 0.22
755 0.23
756 0.24
757 0.26
758 0.27
759 0.28
760 0.30
761 0.32
762 0.34
763 0.35
764 0.37
765 0.40
766 0.42
767 0.45
768 0.48
769 0.51
770 0.54
771 0.58
772 0.62
773 0.66
774 0.71
775 0.76
776 0.82
777 0.88
778 0.95
779 1.02
780 1.10
781 1.19
782 1.29
783 1.41
784 1.53
785 1.67
786 1.82
787 1.99
788 2.17
789 2.38
790 2.61
791 2.88
792 3.16
793 3.48
794 3.84
795 4.25
796 4.72
797 5.20
798 5.74
799 6.35
800 7.03
801 7.78
802 8.61
803 9.54
804 10.58
805 11.75
806 13.03
807 14.45
808 16.05
809 17.81
810 19.76
811 21.89
812 24.24
813 26.80
814 29.60
815 32.60
816 35.82
817 39.22
818 42.86
819 46.62
820 50.51
821 54.49
822 58.51
823 62.42
824 66.44
825 70.18
826 73.80
827 77.22
828 80.43
829 83.32
830 85.94
831 88.24
832 90.31
833 92.04
834 93.59
835 94.86
836 95.93
837 96.75
838 97.46
839 97.99
840 98.42
841 98.75
842 98.97
843 99.06
844 99.16
845 99.22
846 99.18
847 99.16
848 99.09
849 98.98
850 98.88
851 98.71
852 98.59
853 98.46
854 98.36
855 98.20
856 98.09
857 97.98
858 97.87
859 97.76
860 97.67
861 97.58
862 97.49
863 97.42
864 97.36
865 97.30
866 97.29
867 97.23
868 97.20
869 97.18
870 97.18
871 97.20
872 97.21
873 97.22
874 97.26
875 97.30
876 97.34
877 97.38
878 97.42
879 97.49
880 97.55
881 97.61
882 97.69
883 97.75
884 97.83
885 97.89
886 97.95
887 98.01
888 98.07
889 98.11
890 98.21
891 98.25
892 98.32
893 98.27
894 98.42
895 98.36
896 98.43
897 98.36
898 98.44
899 98.38
900 98.48
901 98.37
902 98.44
903 98.35
904 98.38
905 98.31
906 98.30
907 98.16
908 98.21
909 98.17
910 98.20
911 98.09
912 98.14
913 98.06
914 98.04
915 97.98
916 97.98
917 98.02
918 97.89
919 97.92
920 97.85
921 97.86
922 97.85
923 97.92
924 97.90
925 97.91
926 97.88
927 97.92
928 97.90
929 97.96
930 97.96
931 98.01
932 97.99
933 98.01
934 98.10
935 98.11
936 98.11
937 98.10
938 98.13
939 98.20
940 98.28
941 98.22
942 98.34
943 98.32
944 98.32
945 98.31
946 98.35
947 98.32
948 98.37
949 98.33
950 98.34
951 98.32
952 98.31
953 98.26
954 98.26
955 98.22
956 98.19
957 98.12
958 98.13
959 98.06
960 98.06
961 98.01
962 97.98
963 97.88
964 97.89
965 97.81
966 97.82
967 97.72
968 97.68
969 97.67
970 97.67
971 97.62
972 97.57
973 97.51
974 97.49
975 97.48
976 97.54
977 97.50
978 97.50
979 97.51
980 97.56
981 97.56
982 97.54
983 97.56
984 97.60
985 97.60
986 97.66
987 97.70
988 97.78
989 97.78
990 97.83
991 97.87
992 97.94
993 97.96
994 98.05
995 98.07
996 98.10
997 98.18
998 98.19
999 98.21
1000 98.21
1001 98.26
1002 98.26
1003 98.28
1004 98.23
1005 98.24
1006 98.24
1007 98.12
1008 98.03
1009 98.03
1010 97.89
1011 97.87
1012 97.69
1013 97.58
1014 97.41
1015 97.29
1016 97.06
1017 96.92
1018 96.66
1019 96.50
1020 96.25
1021 96.03
1022 95.73
1023 95.51
1024 95.21
1025 94.93
1026 94.57
1027 94.27
1028 93.95
1029 93.61
1030 93.18
1031 92.83
1032 92.49
1033 92.15
1034 91.74
1035 91.36
1036 90.92
1037 90.57
1038 90.21
1039 89.85
1040 89.46
1041 89.10
1042 88.69
1043 88.31
1044 87.91
1045 87.56
1046 87.18
1047 86.85
1048 86.55
1049 86.19
1050 85.85
1051 85.56
1052 85.24
1053 84.95
1054 84.68
1055 84.37
1056 84.12
1057 83.88
1058 83.63
1059 83.41
1060 83.23
1061 82.98
1062 82.72
1063 82.56
1064 82.48
1065 82.33
1066 82.15
1067 81.99
1068 81.97
1069 81.85
1070 81.75
1071 81.64
1072 81.60
1073 81.53
1074 81.52
1075 81.44
1076 81.46
1077 81.39
1078 81.43
1079 81.40
1080 81.48
1081 81.49
1082 81.51
1083 81.48
1084 81.57
1085 81.58
1086 81.59
1087 81.68
1088 81.81
1089 81.75
1090 81.83
1091 81.94
1092 82.01
1093 82.01
1094 82.10
1095 82.21
1096 82.26
1097 82.28
1098 82.35
1099 82.40
1100 82.49


 

Mounted Industrial Filter [IF]


MountThicknessID
CMT2mm1090467
CMT1mmID to be defined
SH 25.52mm1087228
SH 25.51mmOn request only
SH 27.02mm1086965
SH 27.01mmOn request only
SN1 30.52mm1088115
SN1 30.51mmOn request only
SH 34.02mm1106994
SH 34.01mmOn request only
SH 35.52mm1090486
SH 35.51mmOn request only
SH 37.02mm1085793
SH 37.01mmOn request only
SH 39.02mm1106995
SH 40.52mm1090151
SH 43.02mm1091456
SH 46.02mm1086642
SH 49.02mm1091457

Order nomenclature
IF LP 820 HT [Mount] [Thickness]
Example: IF LP 820 HT SH 25.5 2
 

Unmounted Industrial Filterglass [IFG]


DiameterThicknessID
22.0 mm2mmID to be defined
22.0 mm1mmID to be defined
23.0 mm2mmID to be defined
23.0 mm1mmOn request only
24.0 mm2mm1086725
24.0 mm1mmOn request only
29.0 mm2mmID to be defined
29.0 mm1mmOn request only
31.0 mm2mmID to be defined
31.0 mm1mmOn request only
33.0 mm2mmID to be defined
33.0 mm1mmOn request only
34.0 mm2mm1084183
34.0 mm1mmID to be defined
36.0 mm2mmID to be defined
38.0 mm2mmID to be defined
40.0 mm2mmID to be defined
43.0 mm2mm1084184
46.0 mm2mmID to be defined

Order nomenclature
IFG LP 820 HT [Diameter] [Thickness]
Example: IFG LP 820 HT 23.0 2
 

Mounts for Industrial Optical Filters

C-Mount

Defined by 1” (25.4mm) diameter and 32 turns per inch pitch, the C-Mount thread is a popular camera mount in machine vision industry. Schneider-Kreuznach offers a C-Mount option for most filters. So filters can go in any C-Mount based mechanics in vision systems.

Another popular application, C-Mounts can easily be used for, is placing a filter in front of the sensor into the camera. The extension of the back flange distance has to be considered for imaging applications.

Key Features of C-Mount Filters:
Fits in C-Mount cameras
Black Anodized Brass

Applications of C-Mount Filters:
To be mounted in C-Mount cameras
Vision Systems based on C-Mount mechanics

Thread Diameter Clear Thickness
Aperture
1'' - 32 25.4 mm 21.1 mm 3.6 mm

 

Filter C-Mount

 

 

SH-Mount

Schneider-Kreuznach offers a variety of mounts with common thread sizes to fit on most camera lens systems. SH-Mount is the standard, when high flexibility is needed. Filters are held by retainer rings. SH-Mounts are extreme robust.

All SH-Mounts have a female and male M-thread, and can be stacked if several filters must be combined.

Key features of SH-Mount Filters:
Stackable
​​​​​Robust
Black Anodized Brass

Applications of SH-Mount Filters:
Mounted on lenses in imaging applications
Mounted on measurement instruments

Thread Diameter Clear Thickness
Aperture
M 25.5x0.5 29.5 mm 20.8mm 6.4 mm
M 27.0x0.5 31.0 mm 21.8 mm 6.4 mm
M 35.5x0.5 39.5 mm 29.8 mm 6.4 mm
M 37.0x0.75 41.0 mm 31.8 mm 6.9 mm
M 39.0x0.5 43.0 mm 33.8 mm 6.4 mm
M 40.5x0.5 44.5 mm 35.8 mm 6.4 mm
M 43.0x0.75 47.0 mm 37.8 mm 6.9 mm
M 46.0x0.75 50.0 mm 40.8 mm 6.9 mm
M 49.0x0.75 53.0 mm 43.8 mm 6.9 mm
M 52.0x0.75 56.0 mm 46.8 mm 6.9 mm
M 55.0x0.75 59.0 mm 49.8 mm 6.9 mm
M 58.0x0.75 62.0 mm 52.8 mm 6.9 mm
M 62.0x0.75 66.0 mm 56.8 mm 6.9 mm
M 67.0x0.75 71.0 mm 61.8 mm 6.9 mm

 

SH Filter-Mount

 

SN1-Mount

The SN1-Mount was designed for the in machine vision popular M30.5x0.5 thread. With its high clear aperture, vignetting can be avoided, even for wide angle applications. The filter is glued into the mount, in order to secure it against vibrations when integrated into robots or production lines. It is ideal to be used in automated fabrication.

SN1-Mounts have a male and female M-thread, and can be stacked if several filters must be combined.

Key features SN1-Mount Filters:
Maximum Clear Aperture
No vignetting
Stackable
Robust
Black Anodized Brass

Applications SN1-Mount Filters:
Mounted on lenses in imaging applications
Mounted on measurement instruments

Thread Diameter Clear Thickness
Aperture
M 30.5x0.5 32 mm 28 mm 6.5 mm

 

SN1 Filter-Mount

 

SN1-Mount

The SN2-Mount is designed for polarizers and achieves highest possible aperture, avoiding vignetting in machine vision systems. Its unique locking mechanism fixes the correct orientation, even in typical industrial environment. The filters are glued into the mount to secure them against vibrations when integrated into robots or production lines. Ideal for use in automated fabrication.

SN2-Mounts have a female and male M-thread, and can be stacked if several filters must be combined.

Key features:
Rotatable
High clear Aperture
No vignetting
Stackable
Robust
Black Anodized Brass

Applications:
Mounted on lenses in imaging applications
Mounted on measurement instruments

Thread Diameter Clear Thickness
Aperture
M 25.5x0.5 27 mm 22.7 mm 7.4 mm
M 27.0x0.5 28.5 mm 23.7 mm 7.4 mm
M 30.5x0.5 32 mm 26.7 mm 7.4 mm
M 35.5 x0.5 37 mm 31.7 mm 7.4 mm
M 37.0x0.75 38.5 mm 32.7 mm 7.4 mm
M 40.5x0.5 42 mm 36.7 mm 7.4 mm
M 43.0x0.75 44.5 mm 37.7 mm 7.4 mm
M 46.0x0.75 47.5 mm 41.7 mm 7.4 mm
M 49.0x0.75 50.5 mm 44.7 mm 7.4 mm

 

SN2 Filter-Mount

DH-Mount

Schneider-Kreuznach offers a variety of mounts for polarizers with common thread sizes to fit on most camera lens systems. The DH-Mount is rotatable to adjust polarization axis in the required orientation. Filters are held by retainer rings.

All DH-Mounts have a female and male M-thread and can be stacked if several filters must be combined.

Key features:
Rotatable
Stackable
Black Anodized Brass

Applications:
Mounted on lenses in imaging applications
Mounted on measurement instruments

Thread Diameter Clear Thickness
Aperture
M 25.5x0.5 27 mm 20.8 mm 9.2 mm
M 27.0x0.5 28.5 mm 21.8 mm 9.2 mm
M 30.5x0.5 32 mm 25.8 mm 9.2 mm
M 35.5 x0.5 37 mm 30.8 mm 9.2 mm
M 37.0x0.75 38.5 mm 31.8 mm 9.2 mm
M 40.5x0.5 42 mm 35.8 mm 9.2 mm
M 43.0x0.75 44.5 mm 37.8 mm 9.2 mm
M 46.0x0.75 47.5 mm 40.8 mm 9.2 mm
M 49.0x0.75 50.5 mm 43.8 mm 9.2 mm
M 52.0x0.75 53.5 mm 46.8 mm 9.2 mm
M 55.0x0.75 56.5 mm 49.8 mm 9.2 mm
M 58.0x0.75 59.5 mm 52.8 mm 9.2 mm
M 62.0x0.75 63.5 mm 56.8 mm 9.2 mm
M 67.0x0.75 68.5 mm 61.8 mm 9.2 mm

 

DH Filter-Mount



 

More Longpass Filters


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+49 (0) 671 601 0

 

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