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*PREORDER* Optolong LRGB Imaging Filter Set - 1.25"
รายละเอียด
รายละเอียด
A. About Optolong's LRGB FIlter Set
The Optolong LRGB Filter Set is designed for maximum contrast and with extremely high gradients for clear differentiation of colors. The LRGB filter set divides the spectrum into its components: red, green, blue and luminance.
The OIII emission overlaps on blue and green filters with maximum transmission to allow high efficiency and natural color imaging. The gap between green and red filters serves to block out the primary Sodium (Na) light pollution line at 589nm and improves color balance and separation.
B. Main Uses and Performance
- Works well with debayered monochrome CCD cameras.
- Suitable for deep sky and planetary CCD imaging.
- RGB imaging allows equal weighting factors for each channel which is very important for automated imaging.
- The ideal raw material for image processing in the sRGB color space is available with the LRGB filter set and a monochrome CCD camera.
C. Spectral Curve Transmission Characteristics
- 95% transmission at passband.
- High and precise blocking of offband.
- 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
How to read the chart?
▲The horizontal axis is the Wavelength in Nanometers(nm).
▲The vertical axis is transmission in %.
▲The WHITE line shows the transmission of the L-CCD filter. R-CCD filter line is shown in RED. G-CCD filter line is shown in GREEN. And the B-CCD linke is shown in BLUE.
LRGB Filters Performance
Ⅰ. M51 © 李召麒
Technic Data:
Telescope: GSO 10" RC
Camera: QHYCCD QHY 695A
Mount: SkyWatcher AZ EQ6 GT
Processing: Adobe Photoshop CC, PixInsight 1.8.8
Filters: Optolong B, Optolong G, Optolong R, Optolong L
Date: 2020年1月2日
Exposure: 100x300"
Copyright@李召麒
Ⅱ. Globular Cluster M5© Astrodoc Ron Brecher
Globular cluster M5 contains hundreds of thousands of stars.and is one of my favourite objects to view in any scope. Bright globular clusters remind me of sugar spilled on a black table cloth.
Tekkies:
Sky-Watcher Esprit 150 f/7 refractor, QHY 16200-A camera,
Optolong L, R, G and B filters, Paramount MX, unguided.
Acquisition, and focusing with TheSkyX. Automation with CCDCommander.
Equipment control with PrimaLuce Labs Eagle 3 Pro computer.
All pre-processing and processing in PixInsight. Acquired from my SkyShed in Guelph.
No Moon, average to above average transparency and average seeing. Data acquired May 25 – June 4, 2019.
23x10m L, 19x3m L, 16x5m R, 16x5m G and 15x5m B (Total = 8hr42m)
Image scale 1.15 arcsec per pixel
III. van den Bergh 152 and Barnard 175 © Astrodoc Ron Brecher
van den Bergh 152 (vdB 152; a.k.a. Cederblad 201) is the prominent blue reflection nebula on the right side of this image. It lies at the end of Barnard 175, the pillar of dust filling this field. The dark area connected to vdB is a Bok globule, a dense accumulation of cosmic dust from which stars are often born. The whole complex lies in the direction of the constellation Cepheus, about 1400 light years away and spanning 7 light years. Interestingly, the bright star illuminating vdB 152 was likely not born within this complex as it is moving through space at a different speed than the nebula.
Tekkies:
Sky-Watcher Esprit 150 f/7 refractor, and QHY 16200-A camera with Optolong LRGB filters. Acquisition, focusing, and control of Paramount MX mount, unguided, with TheSkyX. Focus with Optec DirectSync motor and controller. Automation with CCDCommander. Equipment control with PrimaLuce Labs Eagle 3 Pro computer. All pre-processing and processing in PixInsight. Acquired from my SkyShed in Guelph. Average or better transparency and seeing. Data acquired June 25-July 1, 2020 in a moderately moonlit sky.
90x5m L, 36x5m R, and 22x5m G and B (Total = 11hr10m)
Image scale 1.15 arcsec per pixel
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.