We have a large supply of these if you want to incorporate them into your product. Double Convex lens (almost a plano convex lens as one side is slightly convex) with a front focal length of 85mm, rear focal length of 80mm. Edge thickness is 4.5mm, center thickness is 6.5mm. Has a great bluish/purple anti-reflective coating (coating covers 30mm diameter of the center-not coated 3mm from the edge). Some paperwork included with these references the "Hawk-Eye" (for what it's worth). An incredible price for such a great lens!