Omegon Pro SII CCD Filter 1.25″

Omegon Pro SII CCD Filter 1.25″ is a narrow-band filter that lets through only light with a wavelength of about 672 nanometers - the emission line of ionized sulfur (SII). This type of filter is indispensable for astrophotographers working with monochrome CCD or CMOS cameras who want to capture the full Hubble palette (SII, H-alpha, OIII).

The high peak transmission within a very narrow bandwidth makes even the faintest sulfur structures visible, while effectively suppressing unwanted light - such as from street lights or moonlight. This allows you to take sharp and high-contrast images of emission nebulae such as the Rosette Nebula, the Lobster Nebula or IC 443 (Jellyfish Nebula) even from light-polluted locations.

The filter comes in a durable 1.25″ aluminum mount and is compatible with virtually all common filter wheels and camera adapters. The multiple coating minimizes internal reflections and maximizes the signal in the desired spectrum.

Advantages
✓ Narrowband filter for SII emission line around 672 nm
✓ Specially designed for astrophotography with monochrome cameras
✓ Perfect for use in the Hubble palette (SII, H-alpha, OIII)
✓ Also works under light-polluted conditions
✓ Fits all 1.25″ filter wheels and accessories

Specifications

• Type: Narrowband SII filter for CCD/CMOS
• Connection: 1.25 inches (31.75 mm)
• Transmission band: Center at 672 nm (typically 6-7 nm wide)
• Mounting: Aluminum, black anodized
• Coating: Multiple anti-reflective
• Application: Astrophotography of emission nebulae (SII spectrum)
• Not suitable for: Visual use or color cameras without narrowband sensitivity

Application
The Omegon Pro SII CCD Filter 1.25″ is designed for astrophotographers working with a monochrome camera and using narrowband filters for scientific or artistic nevelop shots. Combine with an H-alpha and OIII filter for full control over color channels and structure. Suitable for deep-sky projects from both dark and urban locations.