Optolong SHO narrowband 2inch Filters Kit

Optolong Improved NB SHO 6.5nm Narrowband Filter Kit (SII + H-Alpha + OIII)

The Optolong Improved NB SHO 6.5nm Narrowband Filter Kit is a professional-grade SHO narrowband filter set designed for advanced deep-sky astrophotography and nebula imaging. Manufactured by Optolong, this premium kit includes SII 6.5nm, H-Alpha 7nm, and OIII 6.5nm filters, optimized for use with astronomical monochrome cooled CCD/CMOS cameras and modified DSLR cameras.

This SHO narrowband kit enables astrophotographers to capture each emission channel separately and then combine them using the famous Hubble Palette (SHO mapping: SII → Red, H-Alpha → Green, OIII → Blue) through astronomical image processing software. The result is highly detailed, scientifically accurate, and visually striking Hubble-style nebula images, even from light-polluted skies.

Optolong SHO Narrowband – Introduction & Purpose

The Optolong SHO 6.5nm filter kit is specifically engineered for single-channel narrowband imaging, isolating key nebular emission lines while strongly suppressing artificial light pollution and atmospheric skyglow. Each filter in the kit targets a precise wavelength with extra-narrow bandwidth, dramatically enhancing contrast, faint signal detection, and structural clarity in emission nebulae, planetary nebulae, and supernova remnants.

Included Filters & Specifications

🔴 SII 6.5nm Narrowband Filter (Sulfur II – 672nm)

• Central wavelength centered near 672nm

• Extra-narrow 6.5nm bandwidth

• Designed for nebula observation

• Strongly blocks mercury vapor, sodium street lights, and skyglow

• Enhances faint sulfur structures often invisible in broadband imaging

🟢 H-Alpha 7nm Narrowband Filter (656nm)

• Popular and highly effective 7nm H-Alpha bandwidth

• Passes hydrogen emission at 656nm

• Excellent suppression of artificial light pollution

• Delivers maximum contrast and reveals fine nebular detail

• Ideal choice for high-contrast narrowband astrophotography

🔵 OIII 6.5nm Narrowband Filter (495.9nm & 500.7nm)

• Extra-narrow 6.5nm bandwidth centered at 500nm

• Isolates OIII emission lines

• Blue-green spectral response

• Widely used for planetary nebulae and supernova remnants

• When combined with H-Alpha, produces images with natural RGB-like color balance

Key Advantages of the Optolong SHO 6.5nm Filter Kit

• ✔ Higher contrast & finer nebula detail

• ✔ Significant reduction in background noise

• ✔ Improved signal-to-noise ratio for faint nebulae

• ✔ Enables full Hubble Palette (SHO) image processing

• ✔ Optimized substrate & upgraded coatings for greatly reduced star halos, especially in OIII

• ✔ Ideal for urban, suburban, and dark-sky imaging

Advanced Coating Technology

Optolong’s improved narrowband filters benefit from state-of-the-art coating techniques:

• Multi-layer anti-reflection coatings

• Non-cemented optical substrate design

• Ion-assisted deposition coating technology for superior durability and scratch resistance

• Stable CWL (Central Wavelength) with no shift due to temperature changes

• Planetary rotation coating system ensures coating uniformity, high pass-band transmission, and deep off-band optical density

These innovations guarantee optical precision, long-term performance, and professional imaging results.

Ideal For

• Monochrome CCD & CMOS astrophotography

• Modified DSLR narrowband imaging

• Emission nebulae, planetary nebulae & supernova remnants

• Hubble palette (SHO) deep-sky imaging

• Light-polluted to dark-sky environments

Why Buy from Modern Telescopes?

Buy the Optolong Improved NB SHO 6.5nm Filter Kit from Modern Telescopes – India’s largest and most trusted telescope store. We supply 100% genuine Optolong products, expert astrophotography guidance, fast pan-India shipping, and reliable after-sales support trusted by astronomers across India.