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MidOpt BN Series Filter BN840

Uniforce Product

Salient Features

 BN840 (Limited Availability)

Commonly used in fluorescence applications, a BN840  filter is suitable for use in LED or laser diode applications with higher than normal ambient lighting conditions and is less sensitive to angle of incidence variations than traditional interference filters.

MidOpt_BN490_graph

BN490

  • Useful Range : 835-845nm
  • FWHM : 35nm
  • Tolerance : +/- 7nm
  • Minimum Peak Transmission : ≥75%
  • Surface Quality : 40/20
  • Compatible LED : 840, 490nm, 500nm

*Not available in 1mm thickness or 25.4™ C-Mount option. For filters thicker than 1mm, we offer an alternative mounting solution that has an overall thickness of 5.5mm. This mount can accommodate filters up to 3.5mm thick.

 

Transmission DataStablEdgeAvailable MountsLearn MoreQuote Request

BN840 Transmission Data

wavelength transmission wavelength transmission
(nm) (%) (nm) (%)
1100 0.03 720 0.01
1090 0.03 710 0.01
1080 0.02 700 0.00
1070 0.03 690 0.01
1060 0.02 680 0.00
1050 0.03 670 0.00
1040 0.01 660 0.00
1030 0.03 650 0.00
1020 0.01 640 0.00
1010 0.01 630 0.00
1000 0.02 620 0.00
990 0.01 610 0.00
980 0.02 600 0.00
970 0.03 590 0.00
960 0.02 580 0.00
950 0.00 570 0.00
940 0.03 560 0.00
930 0.01 550 0.00
920 0.06 540 0.00
910 0.02 530 0.00
900 0.09 520 0.00
890 0.29 510 0.00
880 0.73 500 0.00
870 3.91 490 0.00
860 26.99 480 0.00
850 73.69 470 0.00
840 82.03 460 0.00
830 68.09 450 0.00
820 45.47 440 0.00
810 23.51 430 0.00
800 9.26 420 0.00
790 2.97 410 0.00
780 1.00 400 0.00
770 0.39 390 0.00
760 0.14 380 0.00
750 0.06 370 0.00
740 0.04 360 0.00
730 0.01 350 0.00

midopt_stabledge-filter-ex

Click Pic to Enlarge

MidOpt StablEDGE™ optical filters are specifically designed to be less  susceptible to effects from angular shifting seen when optical filters are placed in front of short focal length (<12 mm) camera lenses.
StablEDGE™ filters take advantage of absorptive filter glass to form the leading
edge of the filter passband.This assures no shifting in this region, even when the
lens FOV exceeds 100°.StablEDGE™ designs are  less angle-of-incidence sensitive, inherently more rugged, and are environmentally stable.

midopt_stableEdge_logo

Available Mounts

Threaded Mount

  • Designed for lenses with filter threads, a variety of filter types and stock threaded sizes are available: M13.25-M105
  • Larger sizes, 62mm to 105mm, are made to order and are not returnable
  • Custom thread sizes are available upon request.
  • Threaded mounts are available as black anodized aluminum rings. Rotating mounts with locking thumb screws are generally provided.

Ordering Example:

  • Filter: BP470
  • Mount Size: M27

Correct Part# is:

  • BP470-27

Threaded Mount Technical Drawing PDF

Slip Mount

  • Designed for varifocal lenses, wide angle lenses and lenses without filter threads
  • Accommodates standard threaded mounts
  • Low profile and oversize diameter design prevents wide angle lens vignetting
  • Locking set screws and a wrench are provided to secure the adapter to the lens
  • Many varifocal and shorter fixed focal length (wide angle) lenses are not supplied with filter threads due to the presence of a protruding, strongly convex lens element. Our slip mount adapters allow standard threaded filters to be fitted securely to these and a large variety of lenses that do not have filter threads provided.

Ordering Example:

  • Filter: BP470
  • Outside Diameter of Lens in mm: 43mm

Correct Part# is:

  • BP470-S43

Slip Mount Technical Drawing PDF

C/CS Camera Mount

midopt-c-mount

  • Designed to thread directly into any C/CS mount camera between the lens and sensor
  • Wrenching slots aid in threading the filter into the camera body. A wrench is supplied with each filter.
  • Helpful in applications with space constraints
  • Can be used with wide angle lenses that do not accept filters at the front end to prevent vignetting
  • C/CS mount filters are available in a standard 1mm thickness

Ordering Example: 

  • Filter: BP470
  • Mount Size: 25.4

Correct Part# is:

  • BP470-25.4

C/CS Camera Mount Technical Drawing PDF

 Unmounted  & Custom Size

midopt-unmounted

  • Any MidOpt filter type can be provided as an Unmounted filter
  • Custom shapes and sizes are typically fabricated with one day to two week lead times
  • Custom filter types with longer lead times can also be quoted. Please contact us regarding feasibility.

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