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LP 400 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 400 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 400 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.

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Technical specifications: LP 400 HT Longpass Filter

TypeOn request
Characteristicsinterference
Angle of indcident0° +/- 8°
Cut-on wavelength400 +/- 5nm
Transmittance415 - 950 nm: Tabs > 90%
415 - 950 nm: Tave > 95%
Blocking<370 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 400 HT



Transmission of the LP 400 HT Filter


 

Transmission Data

 

Download Excel

Wavelength (nm) Transmission (%)
350 0.01
351 0.01
352 0.01
353 0.02
354 0.02
355 0.01
356 0.01
357 0.01
358 0.01
359 0.01
360 0.02
361 0.02
362 0.02
363 0.02
364 0.02
365 0.02
366 0.02
367 0.03
368 0.03
369 0.05
370 0.06
371 0.04
372 0.06
373 0.07
374 0.08
375 0.09
376 0.12
377 0.15
378 0.18
379 0.22
380 0.26
381 0.33
382 0.41
383 0.52
384 0.65
385 1.05
386 1.30
387 1.64
388 2.09
389 2.69
390 3.51
391 4.65
392 6.18
393 8.32
394 11.17
395 15.07
396 20.12
397 26.73
398 34.67
399 44.12
400 54.27
401 64.43
402 73.45
403 80.88
404 86.36
405 90.07
406 92.37
407 93.82
408 94.58
409 95.09
410 95.37
411 95.72
412 96.00
413 96.35
414 96.65
415 96.99
416 97.27
417 97.56
418 97.76
419 97.98
420 98.12
421 98.19
422 98.23
423 98.25
424 98.26
425 98.25
426 98.20
427 98.15
428 98.10
429 98.08
430 98.05
431 98.05
432 98.08
433 98.09
434 98.14
435 98.19
436 98.25
437 98.28
438 98.29
439 98.34
440 98.40
441 98.43
442 98.45
443 98.46
444 98.45
445 98.43
446 98.43
447 98.37
448 98.34
449 98.27
450 98.22
451 98.15
452 98.08
453 98.01
454 97.95
455 97.88
456 97.85
457 97.76
458 97.75
459 97.67
460 97.68
461 97.64
462 97.64
463 97.62
464 97.64
465 97.66
466 97.70
467 97.71
468 97.75
469 97.77
470 97.85
471 97.86
472 97.93
473 97.98
474 98.03
475 98.06
476 98.13
477 98.16
478 98.22
479 98.24
480 98.28
481 98.29
482 98.32
483 98.34
484 98.35
485 98.34
486 98.34
487 98.33
488 98.32
489 98.26
490 98.24
491 98.27
492 98.24
493 98.24
494 98.18
495 98.16
496 98.08
497 98.08
498 98.05
499 98.04
500 98.01
501 97.98
502 97.94
503 97.92
504 97.92
505 97.87
506 97.87
507 97.87
508 97.85
509 97.86
510 97.85
511 97.84
512 97.84
513 97.86
514 97.85
515 97.87
516 97.87
517 97.89
518 97.89
519 97.86
520 97.88
521 97.91
522 97.91
523 97.92
524 97.91
525 97.92
526 97.92
527 97.93
528 97.89
529 97.90
530 97.90
531 97.89
532 97.90
533 97.87
534 97.85
535 97.83
536 97.80
537 97.79
538 97.75
539 97.75
540 97.74
541 97.72
542 97.69
543 97.65
544 97.61
545 97.59
546 97.58
547 97.56
548 97.53
549 97.54
550 97.47
551 97.46
552 97.43
553 97.43
554 97.40
555 97.40
556 97.39
557 97.35
558 97.36
559 97.38
560 97.39
561 97.36
562 97.37
563 97.35
564 97.40
565 97.39
566 97.41
567 97.42
568 97.45
569 97.46
570 97.48
571 97.50
572 97.52
573 97.54
574 97.61
575 97.60
576 97.65
577 97.66
578 97.73
579 97.71
580 97.78
581 97.80
582 97.85
583 97.84
584 97.91
585 97.91
586 97.95
587 97.96
588 97.99
589 98.01
590 98.06
591 98.06
592 98.09
593 98.10
594 98.12
595 98.14
596 98.15
597 98.16
598 98.17
599 98.17
600 98.18
601 98.18
602 98.17
603 98.17
604 98.18
605 98.16
606 98.15
607 98.15
608 98.13
609 98.13
610 98.11
611 98.08
612 98.08
613 98.05
614 98.05
615 98.02
616 98.00
617 97.98
618 97.95
619 97.94
620 97.91
621 97.90
622 97.86
623 97.83
624 97.82
625 97.78
626 97.78
627 97.75
628 97.74
629 97.70
630 97.69
631 97.67
632 97.68
633 97.64
634 97.63
635 97.60
636 97.61
637 97.57
638 97.59
639 97.58
640 97.58
641 97.58
642 97.59
643 97.59
644 97.60
645 97.57
646 97.59
647 97.58
648 97.61
649 97.62
650 97.65
651 97.66
652 97.67
653 97.69
654 97.71
655 97.72
656 97.75
657 97.79
658 97.82
659 97.87
660 97.88
661 97.89
662 97.94
663 97.96
664 98.01
665 98.02
666 98.06
667 98.11
668 98.15
669 98.16
670 98.18
671 98.24
672 98.28
673 98.33
674 98.34
675 98.38
676 98.42
677 98.48
678 98.48
679 98.51
680 98.55
681 98.59
682 98.61
683 98.64
684 98.68
685 98.69
686 98.72
687 98.75
688 98.77
689 98.79
690 98.79
691 98.83
692 98.85
693 98.87
694 98.87
695 98.89
696 98.90
697 98.92
698 98.90
699 98.92
700 98.94
701 98.94
702 98.92
703 98.93
704 98.94
705 98.92
706 98.91
707 98.92
708 98.91
709 98.88
710 98.87
711 98.87
712 98.86
713 98.84
714 98.84
715 98.80
716 98.80
717 98.77
718 98.74
719 98.73
720 98.71
721 98.69
722 98.68
723 98.63
724 98.63
725 98.61
726 98.59
727 98.52
728 98.49
729 98.49
730 98.44
731 98.42
732 98.42
733 98.38
734 98.37
735 98.34
736 98.31
737 98.27
738 98.26
739 98.22
740 98.20
741 98.20
742 98.14
743 98.12
744 98.10
745 98.08
746 98.05
747 98.04
748 98.01
749 98.00
750 97.98
751 97.95
752 97.94
753 97.94
754 97.91
755 97.88
756 97.86
757 97.88
758 97.86
759 97.86
760 97.83
761 97.81
762 97.83
763 97.84
764 97.84
765 97.80
766 97.80
767 97.80
768 97.82
769 97.82
770 97.82
771 97.80
772 97.80
773 97.78
774 97.78
775 97.81
776 97.81
777 97.81
778 97.83
779 97.84
780 97.88
781 97.88
782 97.91
783 97.91
784 97.92
785 97.94
786 97.95
787 97.97
788 97.98
789 97.98
790 98.00
791 98.04
792 98.06
793 98.05
794 98.08
795 98.08
796 98.12
797 98.10
798 98.16
799 98.14
800 98.19
801 98.22
802 98.22
803 98.23
804 98.25
805 98.28
806 98.29
807 98.31
808 98.32
809 98.33
810 98.34
811 98.34
812 98.37
813 98.38
814 98.39
815 98.42
816 98.42
817 98.43
818 98.43
819 98.43
820 98.45
821 98.45
822 98.48
823 98.47
824 98.47
825 98.47
826 98.48
827 98.48
828 98.46
829 98.46
830 98.46
831 98.49
832 98.45
833 98.46
834 98.46
835 98.43
836 98.44
837 98.43
838 98.41
839 98.42
840 98.40
841 98.38
842 98.37
843 98.34
844 98.32
845 98.34
846 98.29
847 98.26
848 98.28
849 98.25
850 98.19
851 98.18
852 98.14
853 98.13
854 98.09
855 98.05
856 98.03
857 97.99
858 97.99
859 97.94
860 97.92
861 97.88
862 97.85
863 97.80
864 97.77
865 97.74
866 97.72
867 97.66
868 97.63
869 97.57
870 97.54
871 97.49
872 97.44
873 97.41
874 97.37
875 97.32
876 97.28
877 97.25
878 97.20
879 97.14
880 97.12
881 97.07
882 97.00
883 96.99
884 96.91
885 96.90
886 96.80
887 96.79
888 96.74
889 96.68
890 96.63
891 96.62
892 96.55
893 96.53
894 96.46
895 96.44
896 96.37
897 96.33
898 96.30
899 96.24
900 96.20
901 96.17
902 96.13
903 96.06
904 96.01
905 95.99
906 95.96
907 95.90
908 95.86
909 95.84
910 95.79
911 95.74
912 95.72
913 95.67
914 95.65
915 95.61
916 95.53
917 95.53
918 95.48
919 95.46
920 95.41
921 95.41
922 95.34
923 95.37
924 95.23
925 95.28
926 95.21
927 95.23
928 95.17
929 95.16
930 95.11
931 95.12
932 95.07
933 95.11
934 95.01
935 95.02
936 94.99
937 94.98
938 94.93
939 94.95
940 94.92
941 94.93
942 94.91
943 94.91
944 94.85
945 94.84
946 94.78
947 94.78
948 94.78
949 94.82
950 94.78
951 94.79
952 94.75
953 94.76
954 94.75
955 94.75
956 94.77
957 94.75
958 94.75
959 94.75
960 94.73
961 94.73
962 94.74
963 94.73
964 94.74
965 94.74
966 94.75
967 94.76
968 94.75
969 94.74
970 94.75
971 94.72
972 94.75
973 94.76
974 94.77
975 94.77
976 94.76
977 94.77
978 94.80
979 94.79
980 94.80
981 94.77
982 94.81
983 94.78
984 94.84
985 94.82
986 94.86
987 94.84
988 94.88
989 94.86
990 94.88
991 94.86
992 94.91
993 94.88
994 94.93
995 94.90
996 94.95
997 94.90
998 94.97
999 94.95
1000 94.98
1001 94.94
1002 94.98
1003 94.95
1004 95.00
1005 94.97
1006 95.01
1007 94.99
1008 95.04
1009 95.02
1010 95.03
1011 95.03
1012 95.04
1013 95.03
1014 95.01
1015 95.01
1016 95.03
1017 95.05
1018 95.03
1019 95.02
1020 95.04
1021 95.03
1022 95.02
1023 95.04
1024 95.04
1025 95.01
1026 95.03
1027 95.01
1028 94.98
1029 94.99
1030 94.96
1031 94.99
1032 94.95
1033 94.95
1034 94.93
1035 94.93
1036 94.89
1037 94.90
1038 94.89
1039 94.87
1040 94.80
1041 94.83
1042 94.77
1043 94.77
1044 94.74
1045 94.76
1046 94.72
1047 94.71
1048 94.65
1049 94.65
1050 94.61
1051 94.60
1052 94.54
1053 94.55
1054 94.48
1055 94.48
1056 94.40
1057 94.42
1058 94.38
1059 94.32
1060 94.27
1061 94.24
1062 94.19
1063 94.19
1064 94.11
1065 94.08
1066 94.03
1067 93.96
1068 93.95
1069 93.92
1070 93.82
1071 93.74
1072 93.68
1073 93.66
1074 93.63
1075 93.58
1076 93.49
1077 93.47
1078 93.40
1079 93.35
1080 93.29
1081 93.25
1082 93.18
1083 93.08
1084 92.99
1085 92.92
1086 92.85
1087 92.82
1088 92.77
1089 92.70
1090 92.60
1091 92.51
1092 92.46
1093 92.42
1094 92.36
1095 92.25
1096 92.18
1097 92.06
1098 92.05
1099 91.94
1100 91.82

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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