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Optolong Ultra High Contrast UHC Filter - 2"

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SKU

OP101-200

ผู้ผลิต

Optolong

จำนวนในสต๊อก

เหลือ 2 ชิ้น

น้ำหนัก

50.00 g

ราคาของเรา

฿2,990.00

ตัวเลือก

จำนวน (เหลือ 2 ชิ้น)

(จาก 1 ถึง 2)

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A. About Optolong's UHC FIlter

The Optolong UHC (Ultra High Contrast) broadband 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)).
Being highly transparent to the main nebula emission lines at OIII (496nm and 500nm), H-beta (486nm), NII (654nm and 658nm), H-alpha(656nm) as well as SII (672nm).

B. Main Uses and Performance

Suitable for enhancing the contrast and details for both visual and photograghic purpose at urban and suburban areas with heavy light pollution.
Suitable for color CCD cameras and unmodified DSLRs.
UHC has a narrower passband and thus provides higher contrast than a CLS (CIty Light Pollution / Light Pollution Reduction) filter. Thus it is more suitable for urban environments where you suffer from severe light pollution.
UHC has a substantial red passband and offer superb views of objects like the Orion Nebula (M42).

C. Spectral Curve Transmission Characteristics

95% transmission of main nebula emission lines:

H-beta 486.1nm, OIII 495.9nm and 500.7nm, H-alpha 656.3nm, and SII 672nm.

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.

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

2" astronomy filter with standard M48.5x0.75 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 45mm.
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.

Optolong UHC Performance

I The Milky Way Hongkong, Cityscape shot by Vincent Cheng

II NGC2244 Rosette Nebula _by Dengyunwei

Using Optolong UHC filter

III You can see the Milky Way in Kunming City, image shot by Yule who used Optolong UHC.

See the compare.

Ⅳ M42 by Jxsky, Optolong UHC filter

V Compare iamge by astrophotographer Luocheng.

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.

ตัวแปลง GSO 2" มีเกลียว T อยู่ด้านใน (สำหรับแปลง T-Adapter ของกล้องดูดาวให้กลายเป็น eyepiece holder ขนาด 2")

แปลง T-Adapter ของกล้องดูดาวให้กลายเป็น eyepiece holder ขนาด 2" เพื่อต่ออุปกรณ์เช่น eyepieces, diagonal ตามความเหมาะสม
ปลายที่ต่อกับกล้องมีเกลีบวที (T-thread) เพื่อต่อกับ T-Adapter
อีกปลายนึงเป็น eyepiece holder ขนาด 2" ที่มี compression ring แบบทิงเหลืองเพื่อป้องกันอุปกรณ์เป็นรอย
ผลิตจากอลูมิเนียมคุณภาพสูง แข็งแรงทนทาน
สินค้าคุณภาพสูง ผลิตในไต้หวัน

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ลดล้างสต๊อก iOptron iEQ45 AZ Base

AZ base for converting iEQ45 from EQ to AZ. Requires pier or tripod (not included)

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฿3,990.00

SALE

iOptron Carry Bag for 2-inch Tripod

Top loading carry bag. Perfect for carrying 2" tripod for CEM60/CEM60EC, iEQ45/iEQ45 Pro, iEQ30/iEQ30 Pro, MiniTower/MiniTower Pro* and CEM25/ZEQ25 mount. Will hold other tripods also (see dimensions).

Durable padded fabric with two adjustable shoulder straps and a waist buckle strap.

* Does not fit 2" MiniTower Pro tripod with triangle mounting plate.

฿1,890.00

สินค้าหมด

เคสแข็งสำหรับ iOptron CEM40 Hard Case

Custom fitting hard case for CEM40

฿3,990.00

SALE

Askar M54 M48 T-Ring for Nikon Z-Mount Mirrorless Cameras

In astrophotography, Nikon, Canon, Sony mirrorless cameras have been used more and more frequently by astronomy amateurs in recent years. Therefore, on the basis of the DSLR camera adapters，Sharpstar have introduced camera adapters suitable for Nikon Z, Canon R and Sony E mirrorless cameras.

Out of the box, this adapter has an installed ring with an M48x0.75 female thread. This can be removed to expose an M54x0.75 female thread.

฿1,490.00

สินค้าหมด

Sky-Watcher 8.4" Pier Extension for EQ6 / EQ6-R / AZ-EQ6

Works on EQ6 and EQ6-R mounts. Raises the mount head 8.4”. Especially useful for owners of long-tube refractor telescopes because it positions the eyepiece at a more comfortable height and prevents the telescope from hitting a tripod leg.

฿3,390.00

PREORDER ZWO FF80 APO 0.75× Full Frame Reducer

FF80APO 0.76X Full Frame Reducer

ZWO has released a new 3-inch FF80APO 0.76X full frame reducer with a three-element optical design, including one element made of ED glass. Its reduction factor is 0.76x, which gives the FF80APO f/7.5 astrograph a shortened focal ratio of f/5.7 and a shorter focal length of 312mm. This allows for less total integration time and a wider field of view, bringing more convenience and possibilities for your wide-field deep sky imaging.

The reducer has a rear interface that attaches to the FF80APO telescope tube’s included four-segment camera extension tube. The back focus is the standard 55mm, and it has a built-in M48X0.75 2-inch filter thread for easy attachment.

฿8,990.00

ราคาช่วงแนะนำ เมาท์ตามดาว Sky-Watcher Wave 150i Strainwave Mount ไม่รวมขาตั้ง

เมาท์ตามดาว Sky-Watcher Wave 150i Strainwave Mount

Wave 150i GoTo strainwave head
Works seamlessly with ASI Air (USB-B cable included)
EQ and AZ modes
Built-in cable management
Weighs 12.8 pounds (5.8kg)
33-pound (15kg) payload capacity without optional counterweight
55-pound (25kg) payload capacity with optional counterweight
Single D/V hybrid saddle
Latitude range from 0° to 90°
Red LED for latitude scale and bubble level
Wi-Fi and Bluetooth
RA power off braking function
RA and DEC home position functions
Requires 12V 2A power (not included)
Optional tripod, pier extension, and counterweight kit not included
Optical Tube not included

฿59,990.00

SALE

Sky-Watcher Dovetail Mounting Plate, Long 33.5cm

Compatible with most Sky-Watcher mounts and drilled to accept Sky-Watcher tube rings.

Also suitable for Celestron, Vixen, Orion and other mounts with Vixen-type saddles.

฿990.00

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