This question already has an answer here:
i have a quick question. We have a machine which has a camera mounted above a board at 75cm. The cameras ability to focus on an object at 0 zoom is 1cm, and all full zoom 120cm. The zoom is build into the camera and i have no idea what optic is on the camera at the moment. To reduce the focal length of the camera at full zoom we use an optic, this enables the camera to focus correctly whist fully zoomed in dispite it only being 75cm away form the camera(not 120cm). This optic is very very expensive however, http://www.edmundoptics.com/optics/optical-lenses/achromatic-lenses/mgf2-coated-achromatic-lenses/67-330
It works fine but i'm not sure we need this, is there way to firstly determine what optic is on the camera by the focal lengths given? and secondly what optic would need to be mounted on front of the camera in order to make the focal length at full zoom 75cm, as i can't take out the optic in the camera all ready i would like something to add to it to make up for the shortfall.
Sorry i'm a programmer and i have to get this camera focusing properly, my knowledge of physics is not great so apology's in advance for what is surely a poorly worded question
Sorry guys the camera im using in a Sony FCB-6500
I have also attached an image from the camera, its a grossing station however as you see there is the need to zoom in and study small object in great detail, at the moment tho the focus is no working so its blurry