focusing ring

基本解释

"By focusing on the glow of the ring's cool dust, Spitzer made it easy to find, " said Verbiscer.
Verbiscer補充道：“通過專注於寒冷塵埃的熱輻射，斯皮策望遠鏡能方便的發現它們。”
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With the structure, the focusing ring can be quickly clamped on the optical mode lens; and assembly and disassembly are convenient and positioning is accurate.
由於本實用新型採用了上述結搆，調焦環可快速地卡裝在光模鏡頭上，拆裝方便、定位準確。
ip.com
We investigate the dependence of the focusing contribution on the order m of local ring of underlying traditional Fresnel zone plate.
在本文中，我們討論了聚焦貢獻對潛在的傳統菲涅耳波帶片上的環的堦次的依賴性。

It is possible to use the focus ring for focusing just like an SLR camera.
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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.
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In macro mode, which can be set by pushing the zoom ring forward while depressing the macro button on the side of the lens, focusing is possible between 8 and 20 inches for close-up shooting with a maximum image magnification of 0.72X (35mm camera equivalent).
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