我周末一直在测试一支从分类广告里淘来的二手 35mm f/1.8。 在 f/2 时锐度出乎意料地高，但对焦环感觉有点发涩。 有人用过较老的版本也遇到这种情况吗？ 正在犹豫是留下它，还是再找一支成色更好的镜头。
Original
Spent the weekend testing a used 35mm f/1.8 I picked up from the classifieds. Surprisingly sharp at f/2, but the focus ring feels a bit gritty. Anyone else experienced this with older copies? Debating whether to keep it or hunt for a cleaner lens.