ZWO Clear Glass Filter D21 is a transparent filter specifically designed to protect your ZWO ASI camera’s sensor from dust, moisture, and scratches, without significantly affecting light transmission. With 95% transmission, your image remains clear and rich in contrast, ideal for both reflecting telescopes and refractors.
Key benefits
✓ High-transmission glass (95%) – maintains sharpness and contrast without color shift
✓ Sensor protection – prevents dust and moisture buildup on the sensor during long sessions
✓ Universal fit – directly compatible with ASI D21 cameras (M42 thread)
✓ Easy mounting – screw it in before any other filter or corrector for maximum protection
✓ Easy maintenance – simple to clean with air blower or lens cloth
Practical application
Place this clear glass filter as the first element in your filter wheel or directly on the camera to protect your expensive mono or color sensor. When used with reflecting telescopes, it prevents dust and moisture from settling during long exposures. With refractors, this filter ensures that UV/IR blockers or narrowband filters stay clean and safe.
Technical specifications
- Format: ASI D21 (M42 x 0.75)
- Filter type: Clear glass
- Transmission: 95%
- Coating: multi-coated for minimal reflection
- Glass thickness: 2 mm
- Mounting: thread
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