f/4大於F/5.6
所有跟帖:
• 是呀 所以人家用600mm f/4而不是諸如150-500mm f/6.3之類。 -用戶名被占用了- ♂ (0 bytes) () 01/04/2013 postreply 11:12:32
• 是呀 所以人家用600mm f/4而不是諸如150-500mm f/6.3之類。 -用戶名被占用了- ♂ (0 bytes) () 01/04/2013 postreply 11:12:32
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