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That makes an effective focal length of 840mm - `the same effect as using binoculars," Davies says. The system is fully motorised with microprocessor control, and the lens offers parfocal selection of five effective focal lengths, four selectable filters and a four-line backlit display of focal length, filter position, focus range and operating status. 5-mm2 with a diagonal dimension of 28-mm, resulting in an effective focal length multiplier of 1. |
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