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china latest news about 2018 The winter Olympics in Pyeongchang

2018 The winter Olympics in Pyeongchang

[2018-02-27 00:58:52]
Warmly congratulate Korea on the successful completion of the 2018 Pyeongchang Winter Olympic Games. And Welcome the 2022 Winter Olympics to be held in Beijing! Read More
china latest news about The relationship between the lens focal length and distance

The relationship between the lens focal length and distance

[2018-02-02 10:29:13]
The relationship between the lens focal length and distance a. The use place and view angle of camera lens: Wide-angle lens: 1. from the perspective of more than 90 degrees, generally used in the elevator car, hall and other small sight angle places such as 2.8MM 2.5MM; 2, from the perspective of 5... Read More
china latest news about 3MP 25mm F1.2 CCTV Lens is released

3MP 25mm F1.2 CCTV Lens is released

[2016-05-19 23:57:04]
25mm F1.2 CS mount lens, with 3.0 Megapixel, manual iris control, hot sale model recently. Read More
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