Back-focus advice on D7000

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donkey_kong

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So, finally got my D7000 the other day from Amazon after Citylink lost my first camera! Just trying to get to the grips with it at the moment with my 17-55mm.

I know there have been lots of threads and talk of the back-focus issue with the D7000 but not managed to find the answer to one problem I'm having:

The focus does seem to be off. Printed off a focus chart and did some tests. I found that the focus is spot on at 55mm f2.8 but when zoom out to 17mm the back focus issue comes into play and eventually at 17mm, it's really bad.

Does anyone have advice on this? My initial thought was do AF fine tune so at 17mm it's in focus but then obviously this will affect the focus at 55mm. Am I testing this correctly? I am focusing a minimum distance when it comes to 17mm in order to get a large enough magnification for it to pick up the chart.
 
donkey_kong said:
So, finally got my D7000 the other day from Amazon after Citylink lost my first camera! Just trying to get to the grips with it at the moment with my 17-55mm.

I know there have been lots of threads and talk of the back-focus issue with the D7000 but not managed to find the answer to one problem I'm having:

The focus does seem to be off. Printed off a focus chart and did some tests. I found that the focus is spot on at 55mm f2.8 but when zoom out to 17mm the back focus issue comes into play and eventually at 17mm, it's really bad.

Does anyone have advice on this? My initial thought was do AF fine tune so at 17mm it's in focus but then obviously this will affect the focus at 55mm. Am I testing this correctly? I am focusing a minimum distance when it comes to 17mm in order to get a large enough magnification for it to pick up the chart.
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This sounds unlikely.

Make sure you are testing the focus correctly (lots of threads on this) in particular at a realistic shooting distance and not too close. Target must be square to the camera.

There is no need to download or print out anything. If you are using an angled sheet of A4 paper printed from a certain website, I'm not surprised you're having problems.
 
I've had the 17-55 attached to my d3100 and never noticed any problems. I'll re check this tonight.

I did a -20 fine tune last night to check the effect and at 17mm its not perfect but usable. It seems to not have affected the 55mm focal length. The focus on this is still spot on.
 
Zooms are harder to AF micro adjust. It could be back focused at one end and front focused at the other end and vice versa. Primes are much easier to af adjust. Google dot tune it's decent enough for testing AF accuracy
 
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