ZWO Clear Glass Filter D21

€ 25,90

ZWO Clear Glass Filter D21 for ASI Cameras. Protect your sensor from dust and moisture with 95 % transmission with no image loss.

ZWO Clear Glass Filter D21 is a transparent filter specifically designed to protect the sensor of your ZWO ASI camera from dust, moisture and scratches, without significantly affecting light transmission. With a transmission of 95 %, your image remains clear and contrasty, ideal for both reflecting telescopes and refractors.

Key benefits
✓ High-transmission glass (95 %) - preservation of sharpness and contrast without color shift
✓ Sensor protection - Prevents dust and moisture build-up on the sensor during long sessions
✓ Universal fit - directly compatible with ASI D21 cameras (M42 thread)
✓ Easy mounting - Screw it before any other filter or corrector for maximum protection
✓ Low maintenance - easy 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, you prevent dust and moisture from settling during long exposures. With refractors, this filter will keep UV/IR-blockers or narrowband filters clean and safe.

Technical specifications