Is it the lens or me?

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ziggy5408 New Member • Posts: 12
Is it the lens or me?

So I recently was given a Tamron SP AF 28-75mm f/2.8 XR Di LD Aspherical (IF) Macro, which I was pretty pumped about...Free Lens. But when I started using it I noticed that some pictures were coming out fairly sharp while other looked like someone slid the noise reduction slider to 1000. Im fairly certain i hit my mark with the focus point, so my question is, did I screw up (very likely) or is it the lens?  I attached a couple of examples of what I mean.  Id attach them as raw files but have no clue how to do that.

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Nikon AF-S Nikkor 70-200mm f/2.8G ED VR
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