1. Introduction to Optolong LRGB
The Optolong LRGB filter set divides the spectrum into its core components: Red, Green, Blue, and Luminance. Engineered for demanding deep-sky astrophotographers, this kit delivers maximum contrast with extremely steep gradients for razor-sharp color differentiation.
The OIII emission lines overlap precisely on the Blue and Green filters with maximum transmission to capture highly efficient and natural-colored nebulae details. Furthermore, a calculated gap between the Green and Red filters serves to actively block out the primary Mercury and Sodium light pollution lines (at 589nm), vastly improving overall color balance and celestial separation.
Key Advantages:
- Parfocal Design: Optical thickness balance yields a 1:1:1 parfocal ratio, minimizing the need to refocus between filter changes.
- True Chromatic Reproduction: Creates images in their authentic, original colors while revealing wealth of structural cosmic details.
- Steep Bandpass Gradients: Eliminates unwanted UV and IR interference effectively.
2. Reference Spectrum Chart
※ The transmission curve displayed above is for technical reference purposes.
How to read the chart?
- Horizontal Axis (X): Wavelength in Nanometers (nm).
- Vertical Axis (Y): Transmission percentage (%).
- Color Representation: WHITE line represents Luminance (L-CCD), RED line shows Red (R-CCD), GREEN line shows Green (G-CCD), and BLUE line tracks Blue (B-CCD).
3. Advanced Coating Technology
Optolong filters employ state-of-the-art multi-layer anti-reflection coatings deposited via Ion-Assisted Deposition (IAD) technology. This ensures extreme durability, scratch resistance, and exceptional stability of the Central Wavelength (CWL), completely preventing temperature-induced deviations. The planetary rotation system utilized during production guarantees flawless coating homogeneity across the entire optical substrate surface.
Astrophotography Performance Showcase
I. The Whirlpool Galaxy M51 © Li Zhaoxi
Technical Data: Telescope: GSO 10" RC | Camera: QHYCCD QHY 695A | Mount: SkyWatcher AZ EQ6 GT | Software: Adobe Photoshop CC, PixInsight | Filters: Optolong LRGB Set | Exposure: 100x300"
II. Globular Cluster M5 © Astrodoc Ron Brecher
Technical Data: Telescope: Sky-Watcher Esprit 150 f/7 Refractor | Camera: QHY 16200-A | Mount: Paramount MX | Total Exposure: 8 hours 42 minutes (L, R, G, B channels combined).
III. Reflection Nebula vdB 152 & Barnard 175 © Astrodoc Ron Brecher
Technical Data: Captured from SkyShed using Sky-Watcher Esprit 150 and QHY 16200-A with Optolong LRGB. Total integration time: 11 hours 10 minutes under moderate moonlight.
Packaging Excellence
Every Optolong filter kit ships in protective, high-density cases designed to preserve precision optical surfaces.
Important Technical Notices:
- Color Deviation: Due to ambient lighting, monitor variations, and flash photography, slight color differences may exist between the images and the actual product.
- Interference Coating: Interference filters shift dynamic hues when viewed under varying light angles; this is completely normal.
- Product Updates: Continuous design optimizations may cause technical parameters or appearance changes to update slightly without notice.
| Brand | Optolong |