1.Optolong 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.
Unlike other light pollution filter UHC and CLS, 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.Light pollution filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.
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.
2. Spectrum for Reference
Outer Box: silve box
Plastic Box: PP material
Lining: imported high pressure white EVA material
4. L-Pro Performance
I Comparason image was shot by Arnaud Besancon
All the pictures have been realised with 5D3 Astrodon modded and Samyang 24mm F1,4 at F2, 13s exp. time,3600 isos.
All the pictures are raw,without post-process.
II The Vortex galaxy by Luca Fornaciari Astrophotography
Optolong Astronomy Filter L-Pro 2''
III Ran into Red Sprite again©Vincent Cheng
The Red Sprite is a TLEs (Transient Luminous Events) from the atmosphere, and is part of a family of small creatures that also include even harder to photograph, from rogue sprites to blue jets.
by Optolong_filter 2" L-Pro filter
Ⅳ When the skies were absolutely STEADY, Jim Mayercak shot this Luna
cannot recall EVER having such good "seeing" conditions. The most beautiful Lunar shot to date.Celestron CGEM DX 1100 EDGE HD ZWO ASI071PRO
Optolong L-Pro filter
V Here the final Image of comet 46/P Wirtanen and the Pleiades, shot by Blake Estes.
This imaging run ended up being a marathon that took about 22 hours of processing, using Optolong L-Pro filter for imaging. Its absolutely perfect!
Ⅵ Veil Nebula shot by Andrea Andreotto Maggi with Optolong L-Pro filter 2''
The L-Pro filter filter allowed me to obtain long poses without saturating the stars and to obtain a good separation between the nebula and the sky background while keeping the colors unaltered.