Do I need to know about lenses to buy used?

Started 2 months ago | Discussions thread
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dreamyday New Member • Posts: 1
Do I need to know about lenses to buy used?

I am thinking about buying a used lens, but I see a lot of posts explaining that one needs to test the lens after it arrives. For example, checking for decentering, using a laser, looking at the screws, etc.

I am not knowledgable about lens mechanics and don't know how to do all that. I am a beginner. I wanted to just use a reputed dealer (like MPB) and trust their assessment.

Do you think it is safe to just trust the dealer's assessment without testing it on my own? If not, should I just go for a new one then?

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