LRGB AR deep sky imaging filters
RGB parfocal: 1:1:1; The LRGB filter set divides the spectrum into its components Red, Green, Blue and Luminance. OIII emission overlaps on blue and green filters with maximum transmission to allow high efficiency and natural color imaging. Gap between green and red filters serves to block out the primary Sodium light pollution line at 589nm and improves color balance and separation.
  • Description

  • Specification

1. Optolong LRGB Filters Introduction and Main Use

Introduction 

Optolong LRGB filter set is designed for maximum contrast and with extremely high gradients for clear differentiation of colors.  RGB parfocal 1:1:1; The LRGB filters set divides the spectrum into its components red, green, blue and luminance.

OIII emission overlaps on blue and green filters with maximum transmission to allow high efficiency and natural color imaging. Gap between green and red filters serves to block out the primary Sodium light pollution line at 589nm and improves color balance and separation.

Main Use

  • Work well with debayered monochrome CCD cameras.
  • Suitable for deepsky and planetary CCD imaging.
  • RGB-imaging allows equal weighting factors for each channel, very important for automated imaging.
  • The ideal raw material for image processing in the RGB color space is available with LRGB filter set and mono CCD camera.

 

2. Spectrum and Characteristic

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 filters line is shown in GREEN.  And the B-CCD line is shown in BLUE.

 

 

3. LRGB feature

 

Optolong LRGB Specifications Applicable Model Unit Price in US$
1.25" /1 1/4" mounted) M28.5*0.5 $249
2" mounted M48*0.6 $359
31mm unmounted CCD filter wheel $291
36mm unmounted CCD filter wheel $299

 

 

4. Manufacturing Technology

  • High-precision grinding and polishing to make sure the substrate parallelism is greater than 30" and the surface accuracy is better than λ/4 ;
  • Purified water ultrosonic clearning is aim to effectively remove impurities and dust from the substrate surface.
  • Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change; IAD not only consolidates membrane compactness, increases film firmness, but also changes vacuum coating material characteristics.
  • Planetary rotation system offers precision and homegeneity of coating ensuring high value on transmission of pass-band and Optical density of off-band;
  • Non-cementing optical substrate coating;
  • Quality Control: each filters is examined by Spectrophotometer for spectrum characteristic, and Laser Interferometer for surface accuracy.

 

 

 

 

5. Package 

2019 NEW package

※Note:We are now in the transition from the old to the new packaging style, ship is random.

 

 

6. LRGB Filters Performance

I. Flying Bat Nebula and Squid Nebula, shot by Dr. Ron Brecher(Canada)

Tekkies:

Moravian G3-16200 EC camera, Optolong Ha, O3, R, G and B filters, Takahashi FSQ-106 ED IV at f3.6

Paramount MX, unguided.  All pre-processing and processing in PixInsight.

Gibbous to full moon for Ha, new to crescent moon for O3 and RGB.

Average or better transparency and poor to above average seeing.

74x5m R, G and B, 279x10 Ha and 236x10m O3 unbinned frames (total=104hr).

NB-RGB Processing.

 

II. M51--Whirlpool Galax, shot by Chinese astrophotographer Li Zhaolin.

M51, the Whirlpool Galaxy, also known as 51a, M51a, or NGC5194, is a large spiral Galaxy in the northern constellation Canes Venatici, about 23 million light-years from earth.

Teh spiral galaxy was discovered by Charles Messier on October 13th. 1773. Its comanion galaxy, NGC5159, was discovered by Pierre in 1781. It was the first spiral galaxy to be discovered until 1845, and it was discovered as a vortex by William Parsons, who made the observation through a 72-inch reflecting telescope built at Birr Castle in Ireland.

Technical data:
Telescope: GSO 10" RC
Camera: QHYCCD QHY 695A
Equatorial telescope: SkyWatcher AZ EQ6 GT
Software:Adobe Photoshop CC, PixInsight 1.8.8
Filters: Optolong B, Optolong G, Optolong R, Optolong L
Date: 2nd.,January 2020
Total exposure: 100x300"
Copyright:@李召麒

 

III. NGC2170 Optolong LRGB ©Jerry Huang

 

 

IV. M82 Optolong LRGB + H-Alpha 7nm ©Jerry Huang

 

 

Warm prompt

●About color: due to the influence of ambient light, color difference of the display and flash photography, the color of the product may have some color difference. Detailed color is in accordana with the final product.

●About coating: the interference filter will show different colors under different light, which is a normal phenomenon. Please refer to the material object.

●About the style: in order to improve the product, the change of design/appearance/parameters has not been updated in time. Please see the subject produce.

●About the description: the series of this product have the same material, technology and design, different sizes only, please note.

Optolong LRGB features 4 sizes:

★1.25"(1 1/4" mounted), 2" mounted for eyepiece

★Round 31mm unmounted, 36mm unmounted for filter wheel