The 2006 catalog from Semrock Inc. presents the company’s optical filters for biotechnical and analytical instrumentation. The 36-page, full-color document details offerings for applications ranging from Raman instrumentation to biomedical laser systems to fluorescence instrumentation and microscopy. Among the new items highlighted are the 50-mm-diameter RazorEdge Raman filters and the BrightLine fluorescence multiband and single-band types. The MaxLine laser-line and StopLine laser-blocking filter varieties are described, along with the MaxMirror ultrabroadband mirror. Technical notes cover pixel shift, optical density and the orientation of filters in a microscope.