Omegon Pro SII CCD Filter 2 inch

Omegon Pro SII CCD Filter 2 inch is a professional narrowband filter for astrophotographers working with large sensors and high resolution. The filter targets the SII emission line of ionized sulfur around 672 nanometers - a crucial part of the classic Hubble palette. It allows you to capture faint filament structures and details in emission nebulae that remain completely invisible without a filter.

With a bandwidth of approximately 6-7 nanometers, this filter is capable of delivering exceptionally high contrast even in moderate light pollution. Moonlight, artificial light and unwanted starlight components are effectively suppressed, while high-transmission sulfur emission is allowed through. Ideal for shots of nebulae such as the Horsehead Nebula, IC 443 (Jellyfish), and the Rosette Nebula.

Thanks to its 2″ size, the filter is compatible with full-frame filter wheels and telescope systems with wide optical paths. The robust mount and high-quality multiple coating ensure maximum image quality and minimal reflection.

Advantages
✓ Optimized for sulfur-II emission (672 nm)
✓ Indispensable for Hubble palette narrowband photography
✓ Extremely high contrast - even under light pollution
✓ 2″ version - suitable for large sensors and filter wheels
✓ Multiple coating for maximum transmission and minimum reflection

Specifications

• Type: Narrowband SII filter (for CCD/CMOS)
• Connection: 2 inches (50.8 mm)
• Transmission band: Center at 672 nm, bandwidth about 6-7 nm
• Mounting: Black anodized aluminum with fine threads
• Coating: Multiple anti-reflective
• Application: Astrophotography with monochrome cameras
• Not suitable for: Visual observation or color cameras without narrowband sensitivity

Application
The Omegon Pro SII CCD Filter 2″ is an essential filter for advanced astrophotographers working with a monochrome camera who want to utilize the full narrowband spectrum. Perfect in combination with H-alpha and OIII filters for capturing nebulae with scientific depth and aesthetic results. Excellent for use under both dark and urban skies.