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@ewanmac
I bought a lens from someone on here a few months ago but until now I've not really had much of an opportunity to play around with it. However now I'm looking at the pictures it seems that at shallow DoF the pictures are consistently slightly out of focus.
For example here:
Full size here, f1.8, 1/200, ISO 100, Flash.
In this case I used auto focus and a single focusing point directed at the subject's left eye. As you can see however, the eyes are not sharp while the plane of focus is a couple of cms further away from the camera. I haven't yet had an opportunity take photos of a ruler with the camera on a tripod but the same effect seems present whenever I shoot with a shallow DoF, and I've never noticed it with any of my other lenses.
What are the likely sources of this error and what can I do to try and diagnose the problem?
My first suspicion is whether I've simply bought an incompatible lens, the camera body is DX while I believe the lens is FX compatible (Camera: Nikon D7000, lens: Nikon AF NIKKOR 50mm 1.8D). Might this be the problem?
Alternatively, is the fault more likely to lie in the auto-focus mechanism of the camera body or somewhere in the lens and how do I find out?
I should add that I've not yet discussed this with the seller (although they may read this) and I'm not accusing them of selling me a dud (at least not intentionally), but rather I'm just trying to identify whether a problem exists and whether or not it's caused by my own ineptitude.