Filters Helderglasfilter, voor ASI-camera's, 1,25"

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. If you are using optics with refractive elements (like lenses), an IR blocking filter might be the better alternative.