ZWO IR-blocking filter D21: sharpness and sensor protection for refractors
This interference filter blocks infrared light while protecting the sensor of your ZWO ASI camera from dust and moisture. This is important with refractors: infrared focuses at a different point than visible light, which leads to blurred star edges without a filter. With this IR blocker, your images remain sharp and your colors pure.
Do you use a reflector telescope? Then the cheaper ZWO clear glass filter D21 is sufficient as sensor protection, because reflectors do not have an IR focus shift.
Features
- 90% transmission in the visible spectrum
- Prevents blurring due to IR focus shift in refractors
- Protects the sensor from dust, moisture, and scratches
- Multicoating against reflections and halos
Compatibility
Compatible with ZWO ASI cameras featuring a D21 window and M42 connection. Mount the filter as the first element on the camera or in the filter wheel.
Specifications
| Format | D21 (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 D21-format refractor filter of ZWO. For the larger window, there is the D25 version.
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