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Optolong OIII Narrowband (6.5nm) Filter - 1.25"

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SKU

OP115-125

ผู้ผลิต

Optolong

จำนวนในสต๊อก

เหลือ 2 ชิ้น

น้ำหนัก

50.00 g

ราคาของเรา

฿5,290.00

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จำนวน (เหลือ 2 ชิ้น)

(จาก 1 ถึง 2)

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A. About Optolong's O-III (6.5nm) FIlter

The Optolong O-III (Oxygen-III) extra-narrowband filter is designed to improve the visibility of various deep sky objects. It does this by:

Selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lighting (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)).
Allowing only 6.5nm bandwidth of light centered on a wavelength of 500nm to pass through, which corresponds to OIII emission lines.

This is a blue-green colored filter as OIII emits 495.9nm and 500.7nm. Many images of planetary nebulae and supernova remnants are taken only with H-alpha and OIII filters. They show great structural details, but have natural colors, looking like an RGB image.

B. Main Uses and Performance

Suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants.
Suitable for color CCD cameras and modified DSLRs for astrophotography.
Hubble look of images can be made by the combination of H-alpha, OIII-CCD and SII-CCD images, such as the famous "Pillars of Creation" (M16 Eagle Nebula).

C. Spectral Curve Transmission Characteristics

80% or better transmission at major O-III lines at 495.9nm and 500.7nm.
0.1% transmission of major transmission lines of artificial light pollution:
- Hg (Mercury) at 435.8nm, 546.1nm, 577nm, and 578.1nm.
- Na (Sodium) at 598nm, 589.6nm, 615.4nm, and 616.1nm.
It also blocks out infrared wavelengths (700-1100nm) so a separate IR cut-off filter is not required for imaging applications.

D. Technical Specifications

Both surfaces are fine optically polished, accurate to 1/4 wavelength or better, and parallel to within 30 seconds or arc.
2mm thick Schott B270 optical glass substrate material.
Very high surface quality of 60/40 or better (US Military Spec MIL-O-13830).

E. 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.

F. Other

1.25" astronomy filter with standard M28.5x0.6 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

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.

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วัสดุทำจากอลูมิเนียมและโลหะอย่างดีทำให้ไม่แตกหักและระยะการใช้งานยิ่งขึ้น
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กล้องดูดาว William Optics Slide-base UniGuide 50mm Scope - Blue

William Optics Slide-base UniGuide 50mm Scope - Blue

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แว่นขยาย Levenhuk Zeno Handy ZH37 Magnifier 74061

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ZWO ASI071MC Pro USB3.0 Cooled Color Astronomy Camera (Large APS-C sensor)

ASI071MC Pro

Most famous sensor of Sony
APS-C(1.8″) Diagonal 28.4mm
16M Pixel (4944×3284)
Very low read noise: 2.3e @24db gain 3.3e @lowest gain
14Bit ADC: provide real 14bit Dynamic range
Electronic shutter: no vibration problem with mechanical shutter

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สำหรับใช้อุปกรณ์ขนาด 1.25" ใน Eyepiece holder / Diagonal / ฟอกัสเซอร์ ขนาด 0.965"
ผลิตจากอลูมิเนียมคุณภาพสูง
มี compression ring สำหรับยึด eyepiece ได้แน่นขึ้นและป้องกัน eyepiece เป็นรอย

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ตัวแปลง SVBONY Prime Focus + Variable Eyepiece Projection Camera adapter, 1.25"

Composed of two detachable parts: a prime-focus adapter for prime-focus photography, and a fixed-length or variable extension tube for eyepiece-projection photography.
Supports maximum of 42mm eyepiece diameter
Connects with SLR & DSLR Camera for Eyepiece Projection Photography
Has a handy laser engraved Extension Scale
The 1.25-inch Extendable camera adapter is made of black anodized aluminum and is suitable for all standard 1.25" astronomical telescopes
Easy to connect camera body (needs T-Ring) to a reflector or refractor telescope for either prime-focus or eyepiece-projection photography.
1.25'' barrel is threaded to accept standard 1.25'' eyepiece filters
A thumbscrew in the extension tube holds the telescope eyepiece in place. This combination of prime-focus and eyepiece-projection camera adapter has a sliding barrel design that allows variable projection distances.
Built-in protective pressure ring to prevent eyepiece barrel from being scratched

฿2,490.00

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For filter wheels that accept 36mm unmounted filters
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Suitable for DSLR, webcams, CCD cameras, planetary cameras, black-and-white camera for bright-field shooting
Long-lasting: made with multi-coated glass with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength
Improve image sharpness, blocks ultraviolet and infrared transmissions but lets visible spectrum through
comes with a plastic case With high pressure EVA case lining

Quickly capture dark frames to optimize photo quality
Opaque - blocks all light from the imaging camera sensor. Help remove dark currents - essential for astrophotography
Easily eliminate camera noise and hot pixels
Dark frame acquisition helps remedy such noise and "hot pixels" by canceling out these disruptive effects during image processing
Threaded and can be directly connected to your filter wheelfor fast conversion between different filters;
Made of metal for durability. High quality packing box includes foam-lined plastic case

฿1,090.00

Optolong L-Ultimate 3nm Dual-Band Filter - 1.25"

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฿10,500.00

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*เลิกผลิตแล้ว* Seestar S30 All-in-One Smart Telescope/Camera Tiny and Mighty

A great starter telescope for electronically assisted astrophotography. Price is excellent for the ease of use and quality of pictures. APP is easy to use. Very quick and easy to setup, especially when weather is unpredictable here in Thailand. Beats setting up the large rig.

Bill

Dec 31, 2024

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