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

3. Packing

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

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II M42 compare image by Luca Fornaciari Astrophotography

III The Horsehead Nebula©Luca Fornaciari Astrophotography

Ⅳ Milky Way+Jupiter with Optolong L-Pro filter Copyright:Gernot Obertaxer

Imaging telescope or lens:Sigma 35mm F1.4 DG HSM Art

Camera:Canon6D(a)

Mount:Fornax Mounts Lightrack II Resolution: 5354x3572 Dates:May1,2019 Frames:

Optolong L-PRO: 25x150"ISO1600 Integration: 1.0h

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!

Optolong EOS-C clip filter available for below camera body:

Canon Digital Rebel XS, Canon Digital Rebel XSi, Canon EOS 1000D, Canon EOS 500D, Canon EOS Kiss F, Canon EOS Kiss X2, Canon EOS Kiss X3, Canon EOS Rebel T1i, Canon EOS 60D + 60Da, Canon EOS 7D, Canon EOS 70D,

Canon EOS 50D, Canon EOS 650D, Canon EOS 600D, Canon EOS 550D, Canon EOS 700D, Canon EOS 1100D, Canon EOS 1200D, Canon EOS 40D, Canon EOS 30D, Canon EOS 20D, Canon EOS 10D, Canon EOS D60, 

Canon EOS D30