Not having to realign the optic during the machining of the reflective surfaces reduced an important source of error and helped make folding a viable approach for camera slimming. 不必調整期間反射面減少的一個(gè)重要來(lái)源，加工誤差的光學(xué)，開(kāi)創(chuàng )了一個(gè)折疊式相機減肥可行的辦法。
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