Am i worrying about nothing?

andy1868

andy1868

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Andy
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So, as it goes i have a D7000 that i'm not convinced is focusing right, anything close up it seems to backfocus like a mother! You can manually focus fine but obviously this isn't really a full time solution.

I have fine tuned my 18-105mm and my 50mm to correct this close up, but then whenever the subject is further away it doesn't seem to focus right with it turned on. So i have to turn on the fine tune when close up and off when its further away if that makes sense? Surely this can't be the solution? having spent the best part of £1000 on a body i want it to be able to focus properly. The problem has also replicated itself in my newly acquired tamron 17-50 too so i'm not convinced its right. The only lens that seems to work okay without messing is an old 70-210 AF lens i picked up off here earlier this year, but as the problem seems to be close up then this lens probably won't highlight any problems having been primarily used for motorsport (ie subjects that are far away)

Now, this is where the question comes in, do you guys have any advice on what to try before i take it to the camera shop? i'd love to get to the bottom of it myself if i'm honest. The retailer i bought it from have told me to take it to them for an hour or two and let them check it over which i'm happy to do but i don't really want to waste their time if i don't have to :)

am i being daft? or am i making some faux pas that i just can't see? surely if i'm able to focus fine manually, then when turning the autofocus on it throws it out, surely theres something amiss? or am i thinking about this all wrong?
 
I`m assuming you`re not trying to auto focus closer than the lens will allow?
 
No, I can frame the same shot twice, one with autofocus one with manual. The manual shot will come out fine, the focus confirm indicator will say its out of focus but it is in fact in focus, the autofocus will back focus. When I get to a computer again I can post some examples if that's any help? :)
 
Pics will help. Also have a try at stepping back as you taks a few to determin just where it starts to lose focus. There are bound to be some peeps here that will instantly know if it`s a major problem, but the more info you can give, the easier it will be for them to help you.
 
well, i'm embarrassed. I've been testing it for the past hour or so and i can't get it to fault. Varying lenses, varying focal lengths, various apertures and they've all been fine in test conditions (ie, tripod in my flat :lol: ) baring in mind the tamron hasn't been fine-tuned whatsoever.

tamron at 50mm and 2.8 focused on the A/R, no arguments.
ABR_0574.jpg


same conditions focused on the D/Y, again no arguments
ABR_0576.jpg


i can only put it down to technique or something, whatever it is the camera is behaving as it should :lol: :bang: i'll have to just keep an eye on it, if worse comes to worst its still got plenty of warranty left on it :lol:
 
There are 2 well known faults with certain d7000 one of them is back focusing the other is oil/grease on the sensor. I know someone who had both problems send to Nikon for repair.
 
Try it out again outside in sunlight. Artificial light and polarised light such as that coming in through a window can sometimes do strange things to phase-detect AF systems.
 
I thought my D7000 had a backfocus issue when I first got it, but it turned out to be a duff copy of the 18-105 kit lens. The replacement is much better.

Hope you get yours sorted Andy.
 
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