For the use in front of a CCD- camera we offer you the Astronomik IR- cut off filter. CCD sensors are very sensitive not only in the visual spectral range, but even far into the infrared. On pictures, taken without IR- cut off filter, some objects look totally different, as one knows them from photographs or from visual observation. The IR- radiation produces at all optical systems, where lenses are (also) used for the image (also at eyepiece projection, Barlow- and Shapley- lenses), a more or less big glare around the image of the visual light. You will see this glare also at the best apochromats, if they are not specially calculated for CCD use. The glare will disappear by using an IR- cut off filter in front of the chip.