Nikon has added two new petite models to its mirrorless Nikon 1 line, with the 18.4-megapixel J4 and the 14.2-megapixel S2 . Both interchangeable-lens cameras offer a number of upgrades from their predecessors including an increased ISO light sensitivity range to 12,800 (practically night vision). Both cameras are also more compact and lightweight than their predecessors.