... f-number f数，光圈数 f-stop f制光圈 far point远点 ...
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f stop f 光阑
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A large opening (small f-stop number) gives you a very shallow DOF, and a small opening (big f-stop number) gives you a much deeper DOF.
一个大洞的开启(小f值)会带给你浅度景深，而一个小的开启(大f值)则会给你一个深度景深。
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His favourite piece of tech is his F-Stop Satori EXP, a rucksack he uses when carrying his gear to remote locations.
BBC: Pro photographers reveal their top travel gear
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