55-250的镜头是能支持多大的放大倍数

Xav

刚刚买的镜头，不怎么内行，想问一下。还有买那个镜头前的圆环 是不是很有必要，有什么用，希望大家知道解析一下
jordanchen 发表于 2010-10-1 05:05

do you mean filter or len hood? filter is important as it will protect your len from element like dust and water, len hood is optional as it cut the sun flare from entering your len when you are under the bright sun...