Optolong UV-IR Cut Filter - 31mm Unmounted - UVIR-31U
| Article number: | UVIR-31U |
| Availability: | More on the Way to us |
| Delivery time: | More on the Way to Us |
Improve image sharpness with the addition of an Optolong UV-IR Cut Filter, which blocks Ultraviolet and Infrared transmissions but lets the visible spectral region shine through. The IR (700nm to 1100nm) and UV (300nm - 400nm) part of the spectrum are invisible to human eyes, but not to most CCD and other digital cameras, which are sensitive to 300nm to 1100nm. With the Optolong UV-IR Cut filter installed, violet halos and an overall soft image are a thing of the past. This filter also reflects heat radiation and provides great protection against dust.
The Optolong 31mm Unmounted UV-IR Cut Filter is made with Schott glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL. This UV-IR Cut filter is designed to be used with color filter wheels that accept 31mm unmounted filters.
- Schott B260 substrate material from Germany, 2.0mm thick
- Multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition
- Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces
- Surface quality, according to MIL-O-13830, is 60/40
- 95% transmission at visible spectral region 420-680nm highly passing the major nebula emission lines of H-Alpha 656nm, SII 672nm and NII 654nm and 658nm
- Ultraviolet 300-400nm and infrared wavelength 700-1100nm cut-off
- Optolong’s planetary rotation system is a homogenous and precise coating procedure that ensures both high transmission of pass-band and optical density of off-band
- Each filter comes with a plastic case with high pressure EVA case lining