| NOW SUPPORTS FAST SCOPES (from f2 to f/3.3, RASA, Hyperstar, etc.) !!
A. About Optolong's L-eXtreme Filter The Optolong 2” L-eXtreme filter builds on the success of the renowned L-eNhance filter to deliver an even higher degree of contrast when imaging emission nebulae, planetary nebulae, and supernovae remnants. The L-eXtreme is two filters in one. It has a narrow 7nm passband centered on H-alpha at 656nm and a second 7nm passband centered on OIII near 501nm. The majority of nebulae have their strongest emission at these two wavelengths. Unlike the L-eNhance filter, the L-eXtreme blocks the weaker H-beta emission line at 486nm to deliver more contrast in the fainter regions of nebulae, even in light-polluted sky. The narrower passbands of the L-eXtreme are especially important in blocking moonlight and broadband light pollution found in many urban and suburban centers. The L-eXtreme is an ideal filter for use with DSLRs, one-shot color (OSC), and monochrome CCD and CMOS cameras, especially with fast optical systems. It’s an indispensable filter for urban and suburban astrophotographers and for everyone who likes to extend their imaging sessions into nights when the moon is bright.
B. Spectral Curve Transmission Characteristics
C. Technical Specifications
D. Optical Coating Specifications
E. Other
WARNING: Optolong filters are not designed for direct solar observation. NEVER use these filters for observing the Sun, or permanent eye and equipment damage will result.
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
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
V. NGC6188 Fighting Dragons of Ara ©Tommy Lim KW OBJECTS: NGC6188 FIGHTING DRAGONS OF ARA 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. |
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