The be-all and end-all of of portrait lenses, the SK 150mm f/2.8’s 96mm equivalent focal length and speedy f/2.8 aperture will make you question every portrait you’ve taken without it. The ultra-fast design makes for mind bogglingly thin depth of field, rendering stunningly smooth and pleasing bokeh. The fastest telephoto in Phase One’s arsenal, that pretty little blue ring around the barrel means the 150mm LS can resolve past 100 megapixels, thus making the highest resolution Phase One digital backs a perfect pairing. Though not impossible to shoot hand held, its girth is definitely best paired with a sturdy tripod. As if incredible sharpness and crazy shallow depth of field weren’t enough, the SK 150mm LS also boasts a built-in leaf shutter capable of syncing with strobes at 1/1000s. Say hello to high res headshot heaven.