Optolong UV IR Cut Filter 1.25" Mounted - High Quality Astronomy Camera Filter for DSLR & CCD Imaging - Perfect for Astrophotography & Night Sky Observation
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Description
Optolong UV-IR Cut Filter - 1.25”
This UV-IR Cut Filter, by Optolong, drastically improves image sharpness by blocking Ultraviolet and Infrared transmissions yet permitting the visible spectral region to pass through. The IR (700nm to 1100nm) and UV (300nm - 400nm) wavelengths may be invisible to human eyes, but not to most CCD and other digital cameras. These cameras are particularly sensitive to the 300nm to 1100nm part of the wavelength spectrum. With the Optolong UV-IR Cut filter installed, violet halos and an overall soft image are no more. This filter also reflects heat radiation and provides great protection against dust.
The Optolong 1.25” 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. Each filter cell is made of lightweight, strong metal and is CNC machined, sand-blasted, black anodized, and then laser engraved. The result is a super thin filter cell that will produce a clear aperture of 26mm.
Quality Filter Materials:
- Schott B260 substrate material from Germany, 2.0mm thick
- CNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture; Laser-engraved to prevent fading
- Multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition
Optolong Filter Manufacturing Processes and Parameters
- 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
- Thin metal cells have a clear aperture of 26mm for 1.25” filters
- Each filter comes with a plastic case with high-pressure EVA case lining
About Optolong
Optolong is the Astronomy Filters division of Yulong Optics, an optical filter design, and processing company out of Kunming, China that has provided filters for over 700 optical companies since 1999. All Optolong filters pass European Union RoHS requirements and have been certified by TUV Rheinland and Bureau Veritas.
