This is an SMA fiber coupler (FC style also available) with an interface flange mount to the input port of a Sciencetech monochromator or spectrograph (fiber not included). Please note two versions are available. One version is for the Sciencetech 9030 monochromator which utilizes its own slit interface flange design. The other version is for all other Sciencetech Series 9000 and 8000 monochromators and spectrographs which use a common slit interface flange design. With an FIB1 at the input port, a slit (fixed or adjustable) is not necessary as the width of the input fiber typically defines the input slit width. Please note that this fiber connection does not address the f number matching issue between the fiber and the monochromator or spectrograph. Hence if it is used at the input port of the monochromator or spectrograph, significant light loss can be expected with the fiber having an f number closer to 1. If this is an issue, please speak to a Sciencetech Applications Specialist about using a condensing lens assembly with the FIB4 or FIB5 instead.