Sometimes this is of no consequence, or even a bonus. Tricolor imaging is profoundly damaged by this effect, however.
Visible light is transmitted with high efficiency.
The IRX filter is immediately available in a variety of astronomy-standard mounts and sizes. Prices are listed separately. When used 'in series' with any RGB tricolor filter set, the IRX co-filter eliminates the characteristic infrared light 'leak' through the red, green and blue filters. This infrared light leak ruins a Tricolor Image. The IRX filter blocks infrared completely and preserves chromatic accuracy.