Astronomik CLS Light Pollution Filter 2"
Astronomik 2" CLS Light Pollution Filter Highlights
- Eliminates orange glow generated by urban lighting
- Displays more stars and detail in nebulae
- Optimized for telescopes with a filter to telescope aperture ratio of 1:3 to 1:15
- 2" cell-mounted round filter
- The Astronomik CLS Filter provides nearly 100% transmission between 450 nm and 530 nm which includes the visual and h-alpha portion of the spectrum
- All Astronomik filters feature multi-layer coatings for superior protection against scratching, aging and humidity
- Made in Germany, a country renowned for their optical quality!
More About the Astronomik 2" CLS Filter
The Astronomik CLS filter is an excellent option for color as well as black & white imaging of deep sky phenomena such as nebulae, galaxies and star clusters with astronomical equipment of any size. Mercury and sodium-vapor spectral lines are blocked, allowing the largest part of visible light and H-alpha emissions to pass, the CLS filter efficiently shuts out the majority of surrounding light pollution, eradicating that irritating orange glare. Optimized for use with filter to aperture ratios between 1:3 and 1:15. Aberrations and coma are done away with by keeping within these aperture ratios.
Astronomik filters are parfocal with other Astronomik filters. The Astronomik 2" CLS Light Pollution Filter has a thickness of only 1 mm. It is highly resistant to scratches and aging effects, as well as high humidity. Diffraction limited, the filter will not reduce the optical performance of your telescope! Astronomik filters include a high-quality, long lasting, plastic storage box.
Transmission Specifications:
- 92% transmission at 486 nm (H-beta)
- 92% transmission at 496 nm (OIII)
- 92% transmission at 501 nm (OIII)
- 97% transmission at 656 nm (H alpha)
- Pass from 450 to 540 nm and beyond 650 nm