Comparison of RGB image and HeII-SIII-SII narrowband. The HeII is represented in green for better visibility. It is amazing how stars pop out from deep underneath the nebula when using extended red FLI CCD with a HeII filter.
The FLI ProLine E2V CCD47-10-1-109 CCD has extended red sensitivity when compared to standard CCD's. This false-color image of Orion nebula was taken using FLI ProLine E2V CCD47-10-1-109 CCD. The picture was created from images taken through narrow-band filters of SII, SIII and HeII at 10124 A (green). The background stars (green) show clearly in the one micron image: these stars are dimmed by foreground dust at shorter wavelengths and are not seen in a standard `true color' image which is shown in comparison. This is an impressive achievement for a 17 inch Planewave telescope with an FLI extended red CCD.