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Binospec is a high throughput, 370 to 1000 nm, imaging spectrograph thataddresses two adjacent 8' by 15' fields of view. Binospec was commissioned inlate 2017 at the f/5 focus of the 6.5m MMT and is now available to all MMTobservers. Aperture masks cut from stainless steel with a laser cutter are usedto define the entrance apertures that range from 15' long slits to hundreds of2" slitlets. System throughputs, including the MMT's mirrors and the f/5wide-field corrector peak at ~30%. Three reflection gratings, duplicated forthe two beams, provide resolutions ($\lambda$/$\Delta \lambda$) between 1300and $>$5000 with a 1" wide slit. Two through-the-mask guiders are used fortarget acquisition, mask alignment, guiding, and precision offsets. A full-timeShack-Hartmann wave front sensor allows continuous adjustment of primary mirrorsupport forces, telescope collimation and focus. Active flexure controlmaintains spectrograph alignment and focus under varying gravity and thermalconditions.

Binospec: A Wide-field Imaging Spectrograph for the MMT