Optolong L-Pro Clip Filter for Sony Full Frame

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 specific lines where 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 the wavelengths of sodium vapor lighting). It also reduces the background brightness caused by atmospheric oxygen (“sky glow”). 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 rendering. Therefore, it is 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 taken without a filter. Treatment characteristics: The coatings are not cemented to the optical substrate, but are applied via electron-beam evaporation followed by ion-beam-assisted deposition (IBAD process). This special process allows for extreme durability and scratch resistance, ensures the stability of the central wavelength (CWL), and prevents thermal drift. Furthermore, it allows for high transmission in the passband and high optical density in the blocked frequency range. Attention, this filter must never be used alone for observing the Sun!

Main features

Optolong quality for a reliable and satisfying observation experience.

• Type: Filter
• Material: Schott glass
• Optical coating: multi-coated
• Frame: Clip Filter
• Transmission: 95
• Surface accuracy: 1/4

Main technical specifications