1.  Optolong LRGB Introduction

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.

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 sRGB color space is available with LRGB filter set and mono CCD camera.

WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.

2. Optolong LRGB Spectrum and Characteristic
Sbustrate: B270
Thickness: 1.85mm
Tave:  T>90%
Blocking range: 350-1050nm
Blcoking depth: light pollution  line blocking >99%
Surface quality: 60/40
Transmitted Wavefront RMS: λ/4
 Parallelism: 30s

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 line is show in BLUE.

3. Coating Technology

·Multi-layers anti-reflection coating

·Non-cementing optical substrate coating

·Optolong L-Pro filter adopts precision coating based on 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.

·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.

4. Optolong LRGB Gloable Price

5. Packing

Outer Box: silve box

Plastic Box: PP material

Lining: imported high pressure white EVA material

6. Optolong LRGB Performance

I. Andromeda Galaxy (M 31),M 110 andM 32 © Rogerio Alonso

Andromeda Galaxy (M 31),M 110 andM 32

Re-processamento

Imaging telescope / lens - William Optics Apochromatic 80/436 mm ED Refractor

• Imaging cameraZWO Optical ASI1600MM - C (CMOS)

• Mount - Equatorial Sky-Watcher AZEQ6

• Guiding telescope / lens - Orion Achromatic 50/162 mm

• Guiding camera - ZWO Optical ASI120MM (CMOS)

• Filters
Optolong Red 1.25" 
Optolong Green 1.25" 
Optolong Blue 1.25" 
Optolong Luminance (UV/IR block) 1.25"

• Processed with - APT (Astro Photography Tool) DSS (DeepSkyStacker) PixInsight (Pleiades Astrophoto)

• Integration: 6h35min

II. M51 © 李召麒

III. Globular Cluster M5 © Astrodoc Ron Brecher ,this images was published on Astronomy Now in May issue.

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

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 feature:

⭐1.25"(1 1/4"), 2" for eyepiece

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