ZWO IR-blocking filter D25 is an interference filter that effectively blocks infrared light and protects your ASI camera from dust and moisture. With refractor telescopes, this filter prevents focus shift between visible light and IR light, resulting in razor-sharp images. For reflecting telescopes, a clear glass filter is sufficient as a dust cap, but with this IR blocker, you’re always assured of optimal sharpness and contrast.
Key benefits
✓ 90% transmission in visible light for maximum brightness without color transition
✓ Blocks IR light and prevents blur from focus differences
✓ Protects sensor against dust, moisture and scratches during long sessions
✓ Direct fit on M42 thread (D25 format)
✓ Multi-layer anti-reflection coating minimizes loss and halos around stars
Practical application
Screw the IR-blocking filter D25 as the first element in your filter wheel or directly onto your camera mount. With refractors, it increases sharpness and reduces focus issues. Combine with narrowband or color filters for extra contrast and color accuracy.
Technical specifications
- Format: D25 (M42 × 0.75)
- Type: IR-blocking interference filter
- Transmission: 90% in visible spectrum
- Coating: multi-layer anti-reflection
- Glass thickness: 2 mm
- Application: broadband and narrowband astrophotography (photographic)
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