MidOpt Filter TB 550/660/850
Uniforce Product
Salient Features
New Triple Bandpass Green + Red + 850nm NIR
DB660/850 Dual Bandpass Filter Visible Red + NIR
Some of the formulas that are employed in these cases include:
Chlorophyll Vegetation Index
CVI = (NIR * Red) / (Green ^ 2)
Normalized Green
NG = Green / (NIR + Red + Green)
Normalized Near Infrared
NNIR = NIR / (NIR + Red + Green)
Normalised Red
NR = Red / (NIR + Red + Green)
Triangular Vegetation Index
TVI =0.5 * (120 * (NIR – Green) – 200 * (Red – Green))
New MidOpt triple band filters are primarily designed for aerial agriculture mapping and surveying purposes. Green-Red-Near IR data is used for applications where Chlorophyll Vegetation Index (CVI) and other vegetative index monitoring is preferred. TB550/660/850 filters, when mounted in converted consumer cameras, can help in achieving a more affordable, lightweight alternative to systems using three or more cameras or sensors.
TB550/660/850 Transmission Data
| wavelength | transmission | wavelength | transmission |
| (nm) | (%) | (nm) | (%) |
| 1100 | 2.26 | 720 | 0.35 |
| 1090 | 1.00 | 710 | 0.05 |
| 1080 | 0.64 | 700 | 0.04 |
| 1070 | 0.56 | 690 | 0.13 |
| 1060 | 0.66 | 680 | 2.34 |
| 1050 | 0.98 | 670 | 95.46 |
| 1040 | 1.25 | 660 | 95.87 |
| 1030 | 0.89 | 650 | 66.18 |
| 1020 | 0.59 | 640 | 1.90 |
| 1010 | 0.49 | 630 | 0.34 |
| 1000 | 0.50 | 620 | 0.49 |
| 990 | 0.51 | 610 | 0.28 |
| 980 | 0.45 | 600 | 0.62 |
| 970 | 0.45 | 590 | 0.04 |
| 960 | 0.67 | 580 | 0.02 |
| 950 | 1.38 | 570 | 0.15 |
| 940 | 0.61 | 560 | 37.38 |
| 930 | 0.22 | 550 | 95.83 |
| 920 | 0.14 | 540 | 95.80 |
| 910 | 0.14 | 530 | 0.88 |
| 900 | 0.24 | 520 | 0.04 |
| 890 | 0.67 | 510 | 0.42 |
| 880 | 4.06 | 500 | 0.06 |
| 870 | 54.16 | 490 | 0 |
| 860 | 95.65 | 480 | 0 |
| 850 | 95.76 | 470 | 0 |
| 840 | 95.74 | 460 | 0 |
| 830 | 60.55 | 450 | 0 |
| 820 | 4.14 | 440 | 0 |
| 810 | 0.72 | 430 | 0 |
| 800 | 0.39 | 420 | 0 |
| 790 | 0.93 | 410 | 0 |
| 780 | 0.61 | 400 | 0 |
| 770 | 0.08 | 390 | 0 |
| 760 | 0.05 | 380 | 0 |
| 750 | 0.14 | 370 | 0 |
| 740 | 2.32 | 360 | 0 |
| 730 | 0.36 | 350 | 0 |
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
- 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
- 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.
Learn More About
› Learn More About Day/Night Imaging in Color Applications
› Learn More About the Use of Dual Bandpass Filters in NDVI/Agricultural Inspection
