Additional Information
Spectrum for Reference

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 This Milky Way is shot by @YBeletsky
in September with Optolong L-Pro filter for Nikon full frame cameras. Colorful sky over the observatory :) Here is the view of the Magellan telescopes of Carnegie Las Campanas observatory under the stars.

III The Lovers' Tryst shot in The Pinnacles Desert, Western Australia by Astrordinary Imaging
Whenever you are happy or upset, don't forget to share and express love to your loved ones. The Lovers' Tryst shot in The Pinnacles Desert, Western Australia by Astrordinary Imaging with L-Pro filter.

Ⅳ M45 by Gary J Palmer
Imaged earlier in the week with a bright moon. As I like random numbers 76 x 60 seconds processed in Pixinsight. SHARPSTAR 86mm Quad ZWO 094 PRO in ROI Optolong L-Pro filter Sharpcap

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 M31 Andromeda by Gary Palmer
Imaged earlier in the week with a bright moon. 150 x 60 seconds processed in Pixinsight. SHARPSTAR 86mm Quad ZWO 094 PRO in ROI Optolong L-Pro filter Sharpcap

About Optolong
While Optolong is a relative newcomer to the astronomy industry, they are no strangers to optics and filters. Optolong is a division of Yulong Optics Company, a high tech company specializing in optical filter design and production. Their products include bandpass filters, flourescence filters, edge filters, longpass and shortpass filters, beam splitters, anti-reflection coatings, optical mirrors and, of course, astronomical filters.
Established in 1999 and based in Kunming City, China, Optolong/Yulong provides nearly 2000 types of optical filter coatings annually to customers worldwide in a wide variety of industries and applications.