BuyDig offers the Sigma 50mm F1.4 EX DG HSM Lens for Nikon, model no. 310306, or Canon, model no. 310101, for the in-cart price of $399. Coupon code “DigFallSave10″ cuts it to $389. With free shipping, that’s $25 under our June mention of the Canon lens and the lowest total price we could find today for either lens by at least $59. It features a Hyper Sonic Motor for silent, high-speed auto-focus.