Optolong L-Pro 2 Inch Nebula Filter
Optolong L-Pro 2 Inch Nebula Filter
Blocks UV and IR (700 - 1100 nm)
High transmission at passband
Improved color balance for DSLRs and One-Shot Color Astro Cameras, e.g. ASI Color Cameras cooled or uncooled by ZWO.
High optical quality
The L-Pro Nebula filter permits roughly 3x longer exposure times than without a filter and therefore improves contrast significantly.
L-Pro Introduction
Optolong L-Pro (L-Professional) filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).
Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area with heavy light pollution.
Optolong L-Pro is multi-bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast to broadband emission objects such as galaxies, reflection nebulae and globular star clusters. L-Pro is the best choice for light pollution suppression.
Main Use and Performance
Suitable for visual observation and astrophotography.
L-Pro filter has a very low transmission reduction rate against continuous spectrum space objects, and thus is quite effective in suppressing light pollution sources when shooting galaxies, reflection nebulae and globular star clusters. The same holds true for visual star observations.
L-Pro filter alone can suppress infrared wavelength, and thus can be used at ease for “L” image shootings with CCDs.
WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.
L-Pro Specification
Thickness: 1.85mm
Filter Size: 2" Mounted
Clear Aperture: 45mm
