ZWO SII Filter
Best narrow-band filter for capturing detailed nebula imagery.
This filter is the surgical tool you need to pull faint, complex nebulae out of a light-polluted sky. By isolating a razor-thin slice of the spectrum, it forces deep-sky details to pop, though you will need to commit to a multi-filter workflow to capture a full-color image.
$149.00
at
Us
Who it's for
- Astrophotographers shooting from light-polluted urban environments
- Imagers aiming to create professional-grade Hubble Palette composites
- ZWO camera owners seeking seamless hardware integration
Who should skip it
- Budget-conscious hobbyists building their first imaging rig
- Photographers with limited time for long-exposure sessions
- Beginners uncomfortable handling delicate, unmounted optical glass
Performance breakdown
Light Pollution Suppression
Narrow 7nm bandpass effectively isolates target signals from urban skyglow.
Signal Transmission Efficiency
High 90% transmission ensures maximum light capture for faint nebulae details.
Contrast Enhancement
Drastically improves target visibility by stripping away unwanted background noise.
Optical Precision
Fine-polished glass maintains image integrity across the entire sensor field.
Infrared Blocking
Robust cut-off prevents unwanted IR interference from degrading your final image.
Build Quality
Durable construction and included case provide reliable protection for field use.
Key Specs
Bandpass
7nm
Transmission Wavelength
672nm
FWHM
7nm
Glass Thickness
2.0mm
Infrared wavelength 700-1100nm cut-off
Off-band Transmission
<0.1%
Transmission Percentage
90%
Filter Diameter
36mm
Mounting Type
Screw-in
Filter Shape
Round
Know before you buy
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