Autofocus problem...

[imaz]

To all,

I bought D7000 last Sept and trying the following lenses 35mm1.8G, 50mm1.8D, 85mm1.8D,55-300mm 4.5-5.6, I found that the camera was backfocusing. Searching how to solve this problem I came across with the following site My Photography
I did not hesitate and did the process required as carefully as possible. Now I have AF tuning off on the menu and all my lenses are working in an excellent way.

That is insane! Potentially you could make things worst. I have autofocus issues with my D7000 and several lens which I've tested, including Sigma's 18-35mm f/1.8 with USB dock. Pictures are just soft at infinity... Lens were returned and body was sent in for autofocus service - everytime of which the service center claims it is within spec of -18(Nikon tolerant up to -20 before they say it is an issue).

I've just replaced the 18-105 kit lens with Sigma's 17-50mm f/2.8 - we'll see how it goes....

 

[imaz]

That is insane! Potentially you could make things worst. I have autofocus issues with my D7000 and several lens which I've tested, including Sigma's 18-35mm f/1.8 with USB dock. Pictures are just soft at infinity... Lens were returned and body was sent in for autofocus service - everytime of which the service center claims it is within spec of -18(Nikon tolerant up to -20 before they say it is an issue).

I've just replaced the 18-105 kit lens with Sigma's 17-50mm f/2.8 - we'll see how it goes....

OK, after a week of testing the 17-50 sigma, I think it is front focusing. I need at least +20 in fine tune... If I could get +22 then it would be better...

Anyone tried that insane autofocus adjustment using the Allen key in the mirror box? I'm worried I would render it useless?

Though very curious to find out and I'm at my Witt's with the d7000... Very much happy to let it go.



Sent from my Nexus 7 using Tapatalk

 

[imaz]

To all,

I bought D7000 last Sept and trying the following lenses 35mm1.8G, 50mm1.8D, 85mm1.8D,55-300mm 4.5-5.6, I found that the camera was backfocusing. Searching how to solve this problem I came across with the following site My Photography
I did not hesitate and did the process required as carefully as possible. Now I have AF tuning off on the menu and all my lenses are working in an excellent way.

Hi,

So I tried your link and made adjustments to the hex screw behind the mirror. The hex screw on the d7000 is closest to the lens mount and not the one closest to the sensor! ( that one is for the mirror bracket and should not be adjusted )... anyway, I adjusted the hex screw and turned it clockwise which made it AF more blurry in general rather than fix my front focusing issue... it seems the last visit to nikon service center corrected my kit lens back focus issue by far at the service software level which I cant get access to. So it throws my sigma lens front focus....

So I turned back the hex screw counter clockwise back to how it was and get it to front focus again. And just use the finetune AF to +20 to get my sigma to a reasonable sharpness. I wish I had the flexibility to have it around +10 instead, as at +20 means no more adjustment can be made...

I really need to get access to the d7000.exe service software to made AF adjustments to the body at a lower level...

The kit lens no longer needs
AF fine tune.

 

[imaz]

ok, I did more testing and NOW(for some stupid reason), AF Fine Tune +20 and AF Fine Tune OFF makes no difference. Infact, it is like the body has reset to +20 as being Zero!. Which is ideally what I would like the Service center to do, but the body somehow did it self.... I was about to send the body in to get it AF checked again and seems like I dont need to.

However it leads me to say Nikon firmware must be buggy! and that what use to Focus fine now does and vice versa...

Basically you need to review EVERY photo taken on the LCD(since you dont lug around a lappy all the time). It is noticable on the LCD when a photo is tact sharp and those which are average. When I mean tact sharp, as in seeing pours of faces of skin.

 

[alfaholic]

OK, slow down...

Use your computer screen for testing, find some auto-focus chart and then focus from one meter for example, two meters, then 30-40 centimeters and review your photos, if everything works well you should get all photos in focus.
Computer screen and auto-focus chart have very good contrast and your camera can focus easily, so you can see if you really need some adjustments.

 

[imaz]

How about all these auto focus charts suggesting 45 degree angle shots. ..

So computer screen straight on? But that is a flat so it would mean everything be auto focus?