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Anonymous
>>144298
The problem with the plastic one is that the arc focus drive is from 1993, which is pretty slow and almost offensively loud for a modern lens.
The build construction isn't great, but IMHO that isn't the real issue. The f/1.8 simply can't perform in certain low light situations in my experience because it doesn't focus fast enough.
The f/1.4 beats out either f/1.8 by virtue of having the quasi-USM drive. It's not a real magnetic USM, but it's much faster and quieter and I'd recommend it if you need a fast focuser. Otherwise, just get the plastic fantastic and save the money.
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