Research On Photographic Objective With Large Field Of View And Relative Aperture

In the filed of scientific research, industrial and military, we often need to camera thescene or target in the weak light. In conditions of low illumination photography,photographic objective lens is required to have a great relative aperture, and the long-rangephotography required a longer focal length, but this is a contradiction between the two, sothe size of the system tends to become very large.In the condition of no specific user’s need, this thesis designed six kinds ofphotographic objectives which merits and demerits had been done a comparative study.Given the present conditions which involve processing costs and processing cycle, weselected PC system as a practical scheme to be manufactured at last. A photographicobjective as PC system had been manufactured with Φ300mm aperture, F/4and2ω=2°,which has a certain use value and market demand.