例文
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- It has no built-in flash and no way to adjust the focus or exposure.
- The FD7 has an autofocus mechanism, or you can override it and adjust the focus yourself.
- The user will guess or calculate the distance to the subject and adjust the focus accordingly.
- It had two lenses, a fixed handle and a sliding card holder allowing the user to adjust the focus.
- It adds a small drive shaft to the K A-mount, allowing the body to adjust the focus of the lens.