Kit SHO Antlia 3nm Pro 2″ - H-alpha, OIII and SII filters

Kit SHO Antlia 3nm Pro - H-alpha, OIII and SII filters

The SHO Antlia 3nm Pro kit includes the three essential narrow-band filters for Hubble palette astrophotography (SHO): H-alpha (656.3nm), OIII (500.7nm) and SII (672.4nm). Each filter offers a half-value width (FWHM) of just 3nm, enabling precise isolation of nebula emission lines while effectively rejecting light pollution and spurious background signal.

With transmission in excess of 88% on each channel and OD5-rated out-of-band rejection (0.001%), this kit is designed to produce high-contrast images, even in areas of light pollution or in the presence of the Moon. Compatibility with fast optics up to f/3 makes it a versatile choice for all types of astrophotography setups.

Why choose the SHO kit?

The SHO (Sulfur-Hydrogen-Oxygen) palette, made famous by the Hubble Space Telescope, reveals the complex structures of emission nebulae by assigning each channel to a distinct color. By combining the three filters in a SHO composite, the astrophotographer obtains images rich in detail and contrast, highlighting the different layers of ionized gas within deep-sky objects.

Purchasing the complete kit guarantees perfect optical consistency between the three filters: same unglued monoblock substrate, same processing quality, same steep spectral profile. This simplifies image processing and ensures optimum homogeneity between channels.

Filters included in kit

Application and performance

• Complete kit for Hubble palette imaging (SHO) with three perfectly matched filters
• High transmission (>88%) and ultra-narrow bandwidth (3nm) on each channel for maximum contrast
• Steep spectral profile on all three filters to reduce halos around bright stars
• One-piece, unglued substrate to eliminate internal reflections and guarantee durability
• Target objects: emission nebulae, planetary nebulae, Wolf-Rayet stars, supernova remnants
• Can be used in areas of light pollution or dark skies, even in the presence of the Moon
• Compatible with high-speed lenses up to f/3 without significant signal loss
• Blackened edges on unmounted models to limit stray reflections
• Superior optical reliability reduces post-processing corrections
• Designed exclusively for astrophotography of deep-sky objects

Common technical features

Spectral curves

Mounting ring

• 1.25 » (M28.5×0.6), 2 » (M48x0.75)
• Ultra-fine cell for reduced vignetting
• Black anodized finish, unalterable laser engraving

Emission rays covered by SHO kit

• H-α: 656.3nm (hydrogen)
• OIII: 500.7nm (doubly ionized oxygen)
• SII: 672.4nm (ionized sulfur)

Available sizes

• Mounted: 1.25″, 2″
• Unmounted: Ø31mm, Ø36mm, Ø50mm, square 50x50mm

Not recommended for :

• Solar observation
• Visual observation at night

Warning:

NEVER LOOK AT THE SUN WITH THESE FILTERS. Serious eye damage may occur.