SII 5nm Optical Filter for Telescope Astrophotography

Enhance your astrophotography setup with this SII 5nm optical filter, designed to bring out the fine details of sulfur-II emissions in nebulae and deep-space objects. It’s a key tool for producing rich, colour-balanced composite images.

Key Features

• SII 5nm filter isolates sulfur-II emissions at 672nm for high-contrast imaging

• 90% peak transmission maximises light capture for clear, detailed photos

• Narrow bandwidth reduces background glow from light pollution

• Ideal for deep-space photography when combined with H Alpha and OIII filters

• Precision optical coating ensures consistent performance and durability

• Compatible with 2 inch telescope eyepieces and imaging systems

Specifications

• Type: SII Narrowband filter

• Size: 2 inch (50.8mm)

• Central Wavelength (CWL): 672nm

• Bandwidth (FWHM): 5nm

• Peak Transmission: ≥90%

• Blocking: ≥OD5

• Thread: M48x0.75

• Thickness: 1.85mm

Package Contents

• 1 x SII 5nm Filter

• 1 x Material Plastic Box

What Makes This a Smart Buy:
When used alone or alongside OIII and H Alpha filters, this SII filter delivers balanced, high-contrast deep-space images with professional clarity—perfect for advanced astrophotography projects.