Endoscopic objective lens

摘要: PURPOSE:To vary the focal length distance of whole system by integrating a first lens group with part on object side second group, and moving them. CONSTITUTION:This has G1 having negative power, brightness diaphragm S, G2 positive power. The is divided into 1-1 G11 power 1-2 G12 are integrated together to move MG optical axis. A filter F also moved group. When fn, magnification betam, (f) f=fn.betam. To (f), betam can be changed, changed depending this value. GM.