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sysauto
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 对 第7楼 tule502 说：
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非标准尺寸 55.8 mm. 参考下面这段也许能解决你的问题。
The first ring is the plastic sunshade adapter ring that comes with the camera. But even with this extension, you still can't turn the camera on with the lens cap attached. Bummer. The front thread of the adapter ring turns out to have a non-standard thread size -- about 55.8mm. I try adding a 55 to 58mm step-up ring and it falls out.
After some thought, I take the 55 to 58mm step-up ring and glue it into the sunshade adapter ring. This works. You can now use a commonly available 58mm lens cap, and the camera doesn't go crazy if you turn it on without taking off the lens cap.
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