ZWO Clear Glass Filter D21

ZWO Clear Glass Filter D21: sensor protection without image loss

This transparent filter protects the sensor of your ZWO ASI camera from dust, moisture, and scratches, without noticeably affecting the image. With 95% transmission and a multi-coating against reflections, your recording remains clear and contrast-rich.

On reflector telescopes, this clear glass is the logical choice for the camera's end cap. If you use a refractor, choose the ZWO IR-blocking variant in D21 format: this also prevents focus shift caused by infrared light.

Features

• 95% transmission: no visible loss of sharpness or contrast
• Keeps dust and moisture away from the sensor during long sessions
• M42 x 0.75 thread, directly compatible with D21 cameras
• Easy to clean with an air blower or lens cloth

Compatibility

Suitable for ZWO ASI cameras with D21 window and M42 connection. Mount the filter as the first element on the camera or in the filter wheel, before any other filters.

Specifications

Cheap insurance for your sensor ZWO-camera. Confused between clear glass and IR-blocking? Mirror telescope: clear glass. Refractor: IR-blocking.