Optolong Clip Filter for Canon EOS APS-C L-Pro

Optolong Filter This filter is designed to improve the contrast of deep-sky objects and attenuate background sky brightness, thanks to a sophisticated transmission that allows the light of the lines in which deep-sky objects shine (H-alpha, O-III, N-II, H-Beta, S-II...) to pass through, while blocking harmful light emissions (for example, the Hg line or wavelengths from sodium vapor lighting). It also reduces background brightness caused by atmospheric oxygen ("sky glow"). The use of this filter is recommended in areas with light pollution and is suitable for both visual and photographic use. Compared to other light pollution reduction filters, such as UHC or CLS filters, this is a multi-band pass filter that has minimal impact on color rendition. It is therefore suitable for photographing objects that emit continuous light: not only emission nebulae, but also galaxies, star clusters, reflection nebulae, etc. You can achieve exposures up to 3 times longer compared to shots without a filter. Treatment characteristics: The treatments are not cemented onto the optical substrate, but applied via electron-beam evaporation and subsequent Ion-Assisted Deposition (IBAD process). This special process allows for extreme durability and scratch resistance, ensures central wavelength (CWL) stability, and prevents thermal drift. Furthermore, it allows for high transmission in the passband and high optical density in the blocked frequency range. Warning, this filter must never be used alone for observing the Sun! Warning, this filter must never be used alone for observing the Sun! This item is not available for customers in Germany.

Main features

Optolong quality for a reliable and rewarding observation experience.

• Type: Filter
• Optical coating: multiple
• Transmission: 95
• Surface accuracy: 1/4
• Frame: Clip Filter
• Suitable for ...: Canon EOS

Main technical specifications