Optolong 2" LRGB Filter Set

• Deep Sky Broadband CCD Filters: Luminance, Red, Green, and Blue

The Optolong LRGB Filter Set is specifically designed to enhance the contrast and color separation in astrophotography. Here's an introduction to its features and benefits:

Optolong LRGB Filter Set Overview:

• The LRGB filter set divides the spectrum into its core components: Red, Green, Blue, and Luminance (UV/IR Cut).
• These filters are parfocal, meaning they have the same focal point, allowing for easy filter changes without adjusting focus.

Key Features:

1. Maximum Contrast and Color Differentiation:

   • The LRGB filter set is optimized for maximum contrast, ensuring clear and vivid color differentiation in astrophotography.
   • It helps reveal subtle color variations and fine details in celestial objects.

2. OIII Emission Handling:

   • The filters effectively handle OIII (Doubly Ionized Oxygen) emission, which can overlap with blue and green filters.
   • This allows for high-efficiency imaging with natural colors, particularly in nebulae and planetary imaging.

3. Light Pollution Reduction:

   • The gap between the green and red filters serves to block out the primary Sodium light pollution line at 589nm.
   • This feature enhances color balance, reduces the impact of light pollution, and improves overall image quality.

4. True Original Colors:

   • The LRGB filter set enables the creation of images that represent celestial objects in their true, original colors.
   • This provides a rich and natural depiction of astronomical details and phenomena.

5. Steep Bandpass Filters:

   • The filters feature steep bandpass characteristics, which help eliminate interference from ultraviolet (UV) and infrared (IR) wavelengths.
   • This ensures that the captured light is primarily within the visible spectrum, contributing to accurate color rendering.

6. Comprehensive Filter Set:

   • The set includes filters for Luminance (UV/IR Cut), Red, Green, and Blue channels, covering the essential color components needed for color imaging.

The Optolong LRGB Filter Set is a valuable tool for astrophotographers aiming to produce high-quality, true-color images of stars, nebulae, galaxies, and other celestial objects. Its precise design and optical characteristics enhance image quality and allow for natural and detailed astronomical representations.

Using the chart, how do you read it?

The horizontal axis represents the wavelength in nanometers (nm).

In the vertical axis, transmission is expressed as a percentage.

The WHITE line represents the transmission of the L-CCD filter. RED indicates the R-CCD filter line. GREEN represents the G-CCD filter line. The B-CCD left is shown in BLUE.

Coating technology

The coating consists of multiple layers to reduce reflections. An optical substrate coating with non-cementing properties. Optolong filters use precision coating. Based on ion-assisted deposition technology for durability and scratch resistance, as well as stable CWL (central wavelength) with no temperature variation. Planetary rotation system ensures precision and homogeneity of coatings, ensuring high transmission over pass-band and optical density over off-band.