So for a full frame camera that means you can fill the frame with an object as small as 4.8mm x 7.2mm (3mm x 4.5mm for an APS-C camera). "5x" or "5:1" means that the lens will cover an area 1/5th the linear size of the film or sensor.So for a full frame camera that means you can fill the frame with an area as small as 48mm x 72mm (30mm x 45mm for an APS-C camera) "Half life size", "0.5x" and "1:2" all mean that the lens will cover an area twice as wide and high as that of the sensor. So for a full frame 35mm camera, that means you can fill the frame an area as small as 24mm x 36mm (15mm x 22.5mm for an APS-C camera)
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