ZWO Clear Glass Filter D25 effectively protects your ZWO ASI camera sensor against dust, moisture, and scratches without limiting light transmission. With 95% transmission, your image remains bright and rich in contrast, ideal for use on reflecting telescopes. For refractors, a UV/IR-blocking filter is recommended to exclude unwanted wavelengths.
Key benefits
✓ 95% transmission for maximum brightness and contrast
✓ Protects sensor against dust, moisture, and scratches during long exposures
✓ Universal M42 thread fits directly on ASI D25 cameras
✓ Easy to mount as the first element in your filter wheel or directly on the camera
✓ Quick to clean with an air blower or lens cloth
Practical application
Place the clear glass filter in front of all your other filters or correctors to keep your sensor clean and dry. With reflecting telescopes, this filter prevents dust and moisture from entering the optics. With refractors, it keeps your UV/IR blockers and narrowband filters effective longer and free from dirt.
Technical specifications
- Format: ASI D25 (M42 × 0.75)
- Filter type: Clear glass
- Transmission: 95%
- Coating: multi-coated for minimal reflections
- Glass thickness: 2 mm
- Mounting: internal thread
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