The Kyoto tridimensional spectrograph II

The Kyoto tridimensional spectrograph II is a multimode spectrograph. It is so far the only spectrograph with Fabry-Perot and/or integral field spectrograph (IFS) modes that is mounted on the Subaru Telescope. Its pixel/lenslet sampling matches Subaru's excellent image quality. This compact spectrograph is also used at the UH 88-inch telescope. Possible merits of lenslet IFS's are discussed.