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Optolong L-eXtreme 7nm Dual-Band Filter - 2"

ดูรายละเอียดภาพ 4 ดูรายละเอียดภาพ 4 ดูรายละเอียดภาพ 4 ดูรายละเอียดภาพ 4

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SKU

OP139-200

ผู้ผลิต

Optolong

จำนวนในสต๊อก

เหลือ 1 ชิ้น

น้ำหนัก

50.00 g

ราคาของเรา

฿11,490.00

ตัวเลือก

จำนวน (เหลือ 1 ชิ้น)

(จาก 1 ถึง 1)

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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

FWHM: 7nm at O-III and 7nm at H-a
Blocking range: 300 - 1000nm
Light pollution line blocking depth: > 99%

C. Technical Specifications

Both surfaces are fine optically polished, accurate to 1/4 wavelength or better, and parallel to within 30 seconds or arc.
1.85mm thick Schott B270 optical glass substrate material.
Very high surface quality of 60/40 or better (US Military Spec MIL-O-13830).

D. Optical Coating Specifications

Multi layer anti-reflection coated.
Non-cementing optical substrate coating.
Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength) so that there is no deviation due to temperature changes during use.
Precise and homogeneous coatings ensure high values of desired passband and blocking of unwanted offband.
Every single filter is tested and passed by Optolong before shipping to dealers.

E. Other

2" astronomy filter with standard M48x0.75 male filter thread (no female thread, so it cannot be stacked with other filters).
Ultra-thin filter cell to minimize vignetting; clear optical aperture of 26mm.
Precision CNC-machined metal filter cell with sand blasted black anodized finish, anti-reflection treatment, and laser engraving.
High quality protective plastic storage case.

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
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.

GSO 2.5x Apochromatic Barlow lens 1.25"เพิ่มอัตราขยาย eyepiece 2.5 เท่า

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เคลือบเลนส์แบบ Fully Multi-coated (ทุกพื้นผิวที่สัมผัสกับอากาศ) ขอบเลนส์เคลือบสีดำเพื่อลดแสงสะท้อนและเพิ่ม contrast
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ใช้เพิ่มกำลังขยายของ eyepiece เป็น 2.5 เท่า (30x กลายเป็น 75x, 90x เป็น 225x เป็นต้น)
ใช้งานได้กับกล้องดูดาวที่มีขนาด focusor 1.25" มาตรฐานทุกรุ่น
มีเกลียวสำหรับรองรับฟิลเตอร์ 1.25" มาตรฐาน
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ผลิตในไต้หวัน, ประกัน 1 ปี

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กล้องดูดาว William Optics Slide-base UniGuide 50mm Scope - Red

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All New Slide-base UniGuide 50mm Scope
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฿5,990.00

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฿14,390.00

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OAG-L has a large prism size of 12*12mm, far bigger than M68 OAG. The bigger clear aperture brings wider field of view in guiding. It is easy to use, and suitable for users who are interested in long focal length photography.

To take the most advantage of it, we recommend you to match it with large format guiding cameras.

฿6,990.00

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SvBony SV172 Dew Heater for Telescopes and Camera Lens, 400mm

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Provides even heat distribution. Power-efficient design will not result in an extra drain on your power supply.
Three-speed regulator strong-medium-weak heating modes, you can adjust the temperature in different situations
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Great heat preservation effect: Imitating OK cloth, SBR and Black-T three-layer keep warm material fits the lens better, fast and even heating
Alloy fiber heating wire provides super fast and continuous warming, silicone insulation process can prevent internal short circuit
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สินค้าหมด

ZWO 12V 5A AC to DC adapter for cooled cameras and ASIAIR series

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What’s the ASIAIR PLUS?

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ASIAIR PLUS is the third generation of ZWO that has been continuously improved and newly designed since the first generation of ASIAIR was released in July 2018.

฿10,990.00

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GSO 30mm SuperView eyepiece สำหรับกล้องดูดาวขนาดฟอกัสเซอร์ 2"ทุกรุ่น

A superb eyepiece that came with my 10 inch GSO telescope, it gives you wonderful views of The Pleiades etc. and other night sky wonders, it is an excellent eyepiece in my opinion.

James McMahon

Feb 17, 2015

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