ZWO
This "filter" protects the sensor of your camera from dust and moisture, but preserves its spectral response very well.
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ASI D32-2-AR AR Protect Window D=32 mm for ASI Cameras
This "filter" protects the sensor of your camera from dust and moisture, but preserves its spectral response very well.
With all-reflecting telescopes, IR radiation can be recorded without sacrificing sharpness, so this window is a good choice for not losing brightness.
Note: If you are using optics with refractive elements (like lenses), an IR blocking filter might be the better alternative.
This protective window fits, among others, to the the following ASI cameras: