ZWO Clear Glass Filter D25: sensor protection without loss of image quality
This clear glass filter keeps dust, moisture, and scratches off the sensor of your ZWO ASI camera without reducing light transmission. With 95% transmittance and a merk anti-reflective coating, you won’t notice it in your images, while your sensor stays clean and dry during long nights.
On reflecting telescopes, this clear glass is sufficient as a sensor seal. For refractors, the ZWO IR-blocking variant in D25 format is the better choice because it also blocks infrared light and thus prevents focus shift.
Features
- 95% display for maximum brightness and contrast
- Protects the sensor from dust, moisture, and scratches
- M42 x 0.75 thread, directly fitting D25 cameras
- Easy to clean with an air blower or lens cloth
Compatibility
Compatible with ZWO ASI cameras with a D25 window and M42 connection. Mount the filter as the first element on the camera or in the filter wheel.
Specifications
| Format | D25 (M42 x 0.75) |
| Filter type | clear glass |
| Transmission | 95% |
| Coating | multicoating, anti-reflection |
| Glass thickness | 2 mm |
| Assembly | internal thread |
The larger size sensor protection for you ZWO-camera. For the smaller window, there is the D21 version.







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