"Stay with lenses made in the last 15 years."
Let's assume that the lens you purchase doesn't show any signs of abuse. Then, you will most likely get a lens that's very high quality and that is multicoated. It's hard to go wrong with a lens like this.
At the very least, consider staying with multi-coated lenses. You can still obtain good photos with single-coated lenses. But, the later the lens, the less likely it is that you will encounter problems.
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