ZWO IR-blocking filter D21 is a special interference filter that blocks unwanted infrared light and protects your ZWO ASI camera from dust and moisture. With refractors, this filter prevents focus shift between visible and IR light, resulting in sharper images. For reflecting telescopes, a clear glass filter is sufficient, but with the IR blocker you’re prepared for all conditions.
Key benefits
✓ 90% transmission in visible light for brightness without color transition
✓ IR-blocking coating prevents blur from IR focus shift
✓ Protects sensor against dust, moisture, and scratches during long sessions
✓ Standalone D21 filter fits directly into M42 filter wheels or camera mount
✓ Interference technology minimizes reflections and maintains contrast
Practical application
Screw this filter as the first element into your filter wheel or directly onto the camera to eliminate IR light leaks. Use with refractors for maximum sharpness and keep your sensor clean. Combined with narrowband or color filters, it improves overall image sharpness and color accuracy.
Technical specifications
- Format: standalone D21 filter (M42 × 0.75)
- Type: IR-blocking interference filter
- Transmission: 90% in visible spectrum
- Coating: multi-layer anti-reflection
- Glass thickness: 2 mm
- Application: narrowband and broadband astrophotography (photographic)
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