环状影像
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annual ring image 年轮图像
ring optical cutting image method 环形光切图像法
homomorphic image of a ring 环的同态像
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Additionally, it features a macro switching ring on the lens barrel which instantly shortens the minimum focusing distance to approximately 20cm (from image plane), allowing the camera to capture small, close-up subjects with exquisite detail.
ENGADGET: Sony's Cyber-shot RX1 compact camera packs a full-frame sensor, 'fits in your palm' (hands-on)
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