Primary magnification (PMAG) is the magnification of the lens alone. It is the ratio between the camera's sensor size and the field of view; put simply, it is the "work" done by the lens. System magnification is the total magnification from the object to the image on the monitor; this is the "work" done by the entire system. It is the product of the PMAG and the camera-to-monitor magnification (the ratio between the monitor size and the sensor size). Edmund Optics typically uses horizontal values for the sensor-to-field of view ratio and diagonal values for the monitor-to-sensor ratio.
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