translate English to German: When using the Astronomik OIII CCD filter togther with the H-alpha, OIII CCD and the SII CCD filters you can obtain three-color images of emission line objects (gas nebulae) from locations with very strong light pollution. To do so, you would take an image in three different wavelengths, select each one as a color-channel in Photoshop and paste them together as one single color image.
Als EOS Clip Filter ist selbst bei extremer Lichtverschmutzung die Photographie mit DSLR Kameras aus der Stadt möglich.