The 2008-2009 optical filter catalog from !%Semrock Inc.%! presents eight product families and more than 50 new products for applications including fluorescence instrumentation and microscopy, Raman spectroscopy and other laser analytical instrumentation. It showcases a new line of filters for the more popular lasers used in fluorescence imaging, including the newer all-solid-state lasers. Twenty-two tutorials are offered in the 68-page publication.