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 narrowband filters essential for Hubble-style (SHO) astrophotography: H-alpha (656.3nm), OIII (500.7nm) and SII (672.4nm). Each filter offers a full width at half maximum (FWHM) of just 3 nm, allowing for the precise isolation of nebula emission lines while effectively rejecting light pollution and background noise.

With a transmission of over 88% on each channel and an out-of-band rejection rated at OD5 (0.001%), this kit is designed to produce high-contrast images, even in areas with light pollution or when the Moon is present. Its compatibility with fast lenses 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) filter set, made famous by the Hubble Space Telescope, reveals the complex structures of emission nebulae by assigning each channel a distinct color. By combining the three filters into an SHO composite, astrophotographers can produce images rich in detail and contrast, highlighting the different layers of ionized gas within deep-sky objects.

Purchasing the complete kit ensures perfect optical consistency among the three filters: the same one-piece, non-bonded substrate, the same quality of processing, and the same steep spectral profile. This simplifies image processing and ensures optimal consistency across channels.

Filters included in kit

Application and performance

• Complete kit for Hubble-style 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 fast 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» (M48×0.75)
• Ultra-fine cell for reduced vignetting
• Black anodized finish, unalterable laser engraving

Emission lines covered by the 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.