自动对焦镜头 (auto-focusing lens) 标准镜头 (standard lens)
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through-the-lens auto focusing 经由透镜自动聚焦
lens auto focusing 经由透镜自动聚焦
With the focusing lens and the medium pool replacing the back mirror, auto cavity-forming and laser output are realized.
用聚焦透镜和介质池取代激光器的后镜，可自动成腔输出激光。
youdao
What really bewildered us was the lens continuously auto-focusing while the camera remained stationary -- that couldn't be good for the battery, and we'd like to see how battery life fares in upcoming reviews.
ENGADGET: Sony Alpha A390 and A290 DSLRs hands-on Hands-on
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