Shallow depth of field to blur back of cake and background reflection. 1/100 second at f/7.1 and still got a shallow enough depth of field to really blur the background reflection of the shoot-through umbrella on the black Plexiglas. Single focus point on the front frosting garnish on the top front of the cake. Allowed for a sharp focus from the front of the plate to about the mid-point of the cake.
Using Nikon CLS, iTTL. Camera on manual with Nikkor 85mm f1.4D. Camera pop-up flash set to "--" power (Nikon D300 Custom Setting Menu e3 > Commander Mode > Built-in Flash Mode "--") to trigger flashes. SB800 camera left and behind product with 24" silver umbrella, around +.3 EV. SB800 camera right front with 43" shoot-through umbrella and very close to product. EV around 0. EV compensation varied from shot to shot.