MidOpt BP Series Filter BP250
Uniforce Product
Salient Features
Deep-to-Near-UV Bandpass Filter
The BP250 filter is a very broadband UV filter, mainly intended for deep-UV imaging. It is the only MidOpt UV filter available that offers excellent visible and near-IR blocking., thus making it best suited to distinguish features or characteristics that are only visible under UV illumination.
Offered in a limited number of sizes, and not intended for use with standard CCD/CMOS cameras that do not image deep into the UV spectrum.
BP250 Deep-to-Near-UV Bandpass Filter
- Useful Range : 230-275nm
- FWHM : 70nm
- Tolerance : +/- 10nm
- Minimum Peak Transmission : >40%
- Surface Quality : 40/20
The performance of a filter is based on what happens to light passing through the filter. The apparent color of light reflected off the surface is not a reliable way to judge the filter’s capabilities. Batch-to-batch difference in the apparent color of the coatings or filter substrates can often be easily seen when looking at two examples of the same filter type. The color of the coating does not indicate a disparity in performance.
BP250 Transmission Data (Typical)
| BP250 Transmission Data | |||
| wavelength | transmission | ||
| (nm) | (%) | (nm) | (%) |
| 1100 | 0.01 | 650 | 0.01 |
| 1090 | -0.01 | 640 | 0 |
| 1080 | -0.02 | 630 | 0.01 |
| 1070 | -0.01 | 620 | 0 |
| 1060 | -0.03 | 610 | 0 |
| 1050 | -0.02 | 600 | 0 |
| 1040 | -0.03 | 590 | 0.01 |
| 1030 | -0.02 | 580 | 0 |
| 1020 | -0.02 | 570 | 0.01 |
| 1010 | -0.02 | 560 | 0 |
| 1000 | -0.03 | 550 | 0 |
| 990 | -0.01 | 540 | 0 |
| 980 | -0.01 | 530 | 0.01 |
| 970 | 0 | 520 | 0.01 |
| 960 | -0.01 | 510 | 0 |
| 950 | -0.01 | 500 | 0.01 |
| 940 | -0.03 | 490 | 0.01 |
| 930 | 0 | 480 | 0.01 |
| 920 | 0.02 | 470 | 0.02 |
| 910 | 0.02 | 460 | 0.02 |
| 900 | 0.01 | 450 | 0.02 |
| 890 | 0.05 | 440 | 0.03 |
| 880 | 0.02 | 430 | 0.03 |
| 870 | 0.02 | 420 | 0.04 |
| 860 | 0 | 410 | 0.05 |
| 850 | 0.01 | 400 | 0.06 |
| 840 | 0.01 | 390 | 0.08 |
| 830 | 0.01 | 380 | 0.1 |
| 820 | 0.01 | 370 | 0.13 |
| 810 | 0 | 360 | 0.18 |
| 800 | 0 | 350 | 0.23 |
| 790 | 0 | 340 | 0.34 |
| 780 | 0 | 330 | 0.47 |
| 770 | 0.01 | 320 | 0.73 |
| 760 | 0 | 310 | 1.13 |
| 750 | 0 | 300 | 1.79 |
| 740 | 0.01 | 290 | 3.04 |
| 730 | 0 | 280 | 5.55 |
| 720 | 0 | 270 | 10.77 |
| 710 | 0 | 260 | 20.55 |
| 700 | 0 | 250 | 30.77 |
| 690 | 0 | 240 | 28.92 |
| 680 | 0 | 230 | 19.36 |
| 670 | 0.01 | 220 | 11.83 |
| 660 | 0 | 210 | 7.49 |
| 200 | 5.08 | ||
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
Learn More About
› Color Separation for Monochrome Imaging
› Blocking Unwanted Light in Monochrome Imaging
› How Bandpass Filters Increase Resolution in Monochrome Imaging
