D610 back-focussing beyond -20MFD - service or warranty?

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The first time I used my D610 in anger was on my recent holiday and whilst there I noticed my camera was back focussing quite severely.

Yesterday I managed to get the tripod out and try my lenses under controlled conditions and it seems all of my lenses back focus quite a lot and several of them beyond the -20 setting I can go to on MFD.

My question is, do I need to send it for a service or is it a warranty job? I bought it in the UK from John Lewis about 6 months ago.
 
Warrantee if they are nikon lenses. I would send one with it and quote the figure you are getting ie -20.

NOTE ..when you buy any lens you must do the back focus.I have never had a lens that was Zero..if you dont then the lens is focusing on a point you did not pick...remember its really a focus adjustment not "changing a back focus distance"
 
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I've owned many different Nikon DSLRs and never felt the need to adjust (not that I always had that option) as it just seemed to work - any variance when using very shallow DoF was as likely down to user as the camera but this is way off.
 
I recently bought a 28-300 for my D800. At 300mm I photographed a lamp post about 60ft away. All blury. after adjusting the back focus I could read the 1/8 high phone number on the label....OK if your camera has no adjustment then you are stuck but if it does you would be silly not to have it spot on.
 
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