[問題] 請問這顆按鈕如何使用?
這顆鏡頭是nikon 70-210mm f4-5.6
http://www.flickr.com/photos/firmamentx/3822271729/
請問圖中的這顆按鈕要怎麼扳動呢?
http://www.flickr.com/photos/firmamentx/3823074858/
我猜是鎖定光圈用的
只是不知道要怎麼扳動他,深怕不小心扳壞了...
麻煩了
謝謝
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