[Expired] Deal: Lensbaby 50mm f/2.5 Sweet Spot Spark Lens for $79 February 18, 2019 By Eric Reagan B&H has the Lensbaby 50mm f/2.5 Sweet Spot Spark Lens for $79.95 (reg. $199.95) in Nikon mount for today only as one of its Deal Zone deals. Check it out while it lasts here at B&H Photo.