precision optical instrument objective lens Specifications Focal length:40mmF4.0EFL:40.0024TTL:48.3226Max image size:Ø28.0mmDistortion:0.8%Relative illumation:60%Resolution center/corner:3.5Lp/mm, 3.0Lp/mm4 elements lens,black anodize case We offer production ranging from a single test sample to mass production, for optical lenses from ultra-small to big.  About Us 1. Specialized in Custom Order lenses, we precisely meet every type2. Over 9 years of reliable experience in optics industry3. Fast response& rapid delivery4.Your reliable partner here in China.  We’re a professional manufacturer of custom order optical lenses.  Shape: Spherical lens (Plano-convex, Biconvex, Plano-concave, Biconcave), Ball lens, Rod lens, Prisms, Beam splitters, Filters, etc.Our lenses are used in precision instruments of various fields like medical use, microscope, digital camera, telescope, car device, camera, planetarium, broadcastingRead More →