Optolong SHO Filter Kit 7nm 2 inch

Optolong Filters SHO Filter Kit 7nm 2″ is a versatile filter set for astrophotographers who want to capture emission nebulae in the classic SHO color palette. The kit consists of three narrow-band filters - H-alpha, OIII and SII - with a bandwidth of 7 nm. This slightly wider pass provides a good balance between contrast, light output and exposure time.

The filters allow the main emission lines of nebulae to pass through while blocking disturbing background light and light pollution. These properties make the set suitable for use in both dark sky areas and light-polluted environments. The SHO combination allows for colorful and detailed astrophotos in the Hubble palette, with rich textures and artistic interpretations.

All filters feature high-quality multilayer anti-reflection coatings, minimizing halos around stars. The optically polished glass ensures sharpness and contrast even at telescopes with fast aperture ratios up to f/3. The robust 2″ filter cells fit standard filter wheels and adapters.

Observation goals
This filter set is ideal for astrophotographers who want to photograph emission nebulae such as the Rosette Nebula, the Veil Nebula or the Crab Nebula with creative color combinations. The 7 nm bandwidth makes the filters particularly suitable for beginners and advanced photographers who want to combine relatively short exposure times with sufficient contrast and detail.

Specifications

• Type: Narrowband filter set (H-alpha, OIII, SII)
• Bandwidth: 7 nm (FWHM) per filter
• Diameter: 2″ (50.8 mm)
• Emission lines: H-alpha 656 nm | OIII 500 nm | SII 672 nm
• Suitable for: Astrophotography, SHO combination (Hubble palette)
• Coating: Multiple anti-reflection coating, high transmission
• Housing: CNC-machined aluminum filter cells