Additional Information

How to read the chart?
▲The horizontal axis is the Wavelength in Nanometers(nm).
▲The vertical axis is transmission in %.
▲The RED line shows the line of Halph. Green line shows the emmission of OIII. The artifical emission lines are shown in ORANGE.

L-eXtreme Performance
I. Compare: L-eXtreme VS no filter © Vincent Cheng

II. NGC6946, Barnard 150 & Sh2-129 Flying Bat nebula ©José Jiménez
NGC6946, Barnard 150 & Sh2-129 Flying Bat nebula
Canon 6D mod & WO SpaceCat 51
RGB 25 x 600" ISO 3200 - Optolong L-Pro
H-Alpha & OIII 20 x 1500" ISO 3200 - Optolong L-eXtreme

III. The Rosette and Cone Nebulas ©Starizona
The image of the Rosette and Cone Nebulas is an example under about the worst conditions: a very wide field of view (135mm lens, 8 x 5.5 degrees), a very fast focal ratio (f/1.8) and with the 58% illuminated moon only 17 degrees outside the field of view! It is 20 exposures of 90 seconds each with the ZWO ASI294.

IV. IC1396 Elephant Trunk nebula ©José Jiménez
A new job with Optolong L-eXtreme filter and the new Askar Lens FRA 400 tube; IC1396 Elephant Trunk nebula
La Jonquera - Girona - Spain May 2020
Equipment used :
Canon 6D mod
Askar FRA 400mm Sharpstar Optics Fong Michael
RGB 6 x 1500" ISO 6400 Optolong L-eXtreme
Sky Watcher EQ6 Mount
Guide camera QHY5
Flats, Darks & Bias
Calibrated, stacked and processed with Pixinsight,
final tweaks with Lightroom

V. NGC6188 Fighting Dragons of Ara ©Tommy Lim KW
OBJECTS: NGC6188 FIGHTING DRAGONS OF ARA
LOCATION: MERSING, JOHOR
CAMERA: QHY168C
TELESCOPE: 4" REFRACTOR
MOUNT: SKYWATCHER AZ-EQ5GT
FILTERS: OPTOLONG L-EXTREME FILTER.
EXPOSURE: 30 X 300SEC
Stacked in Siril and processed in Pixinsight.

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.