ZWO IR-blocking filter D25: sharpness and sensor protection for refractors
This interference filter blocks infrared light and protects the sensor of your ZWO ASI camera from dust and moisture. With refractors, it prevents the focus of visible and infrared light from diverging, which without a filter results in soft star edges and color fringing. The result: sharp images with pure colors.
For reflecting telescopes, the ZWO Clear Filter D25 suffices as a cover; mirrors do not have IR focus shift.
Features
- 90% transmission in the visible spectrum
- Blocks infrared and prevents focus differences
- Protects the sensor from dust, moisture, and scratches
- Multicoating minimizes loss and halos around stars
Compatibility
Suitable for ZWO ASI cameras with a D25 window and M42 connection. Mount as the first element on the camera or in the filter wheel; combine with narrowband or color filters for extra contrast.
Specifications
| Format | D25 (M42 x 0.75) |
| Filter type | IR-blocking interference filter |
| Transmission | 90% in the visible spectrum |
| Coating | multicoating, anti-reflection |
| Glass thickness | 2 mm |
The D25-size refractor filter of ZWO. For the smaller window, there is the D21 version.
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