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AF Fine Tune & D7000

brunohornbeck

US
5 posts

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brunohornbeck Silver Member Nikonian since 29th Jan 2013
Thu 14-Feb-13 09:54 PM

Based on input from the members of this forum I recently replaced a D70 with a D7000 and I'm quite happy. In working with the 18-70 lens from the D70 kit on the D7000 I found a need to fine tune the auto focus on that lens. Using the lens at about 45 mm, spot focus, a tripod, flash because of weather and the need to work inside, and trial and error it appears that a -5 correction was needed.

I never found a reason to be concerned with the D70 & this lens, but I guess the additional resolution of the D7000 brought out the problem. It took the better part of a week to narrow the problem down by eliminating a uv filter used for lens protection, noise and other pixel peeping concerns under 100% view in Nikon Capture NX2, lens shake blamed on an aging photographer, and a series of other concerns didn't make sense but seemed reasonable.

Is that correction likely to suffice throughout the zoom range and various appertures on the lens? If not, now what??

billD80

US
2241 posts

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#1. "RE: AF Fine Tune & D7000" | In response to Reply # 0

billD80 Silver Member Nikonian since 22nd Jan 2007
Thu 14-Feb-13 10:31 PM

>I never found a reason to be concerned with the D70 & this
>lens, but I guess the additional resolution of the D7000
>brought out the problem.

That aspect is important to keep in mind. 100% enlargement on your PC likely translates into an absolutely enormous print on paper.

So, even if the focus varies a bit through the zoom range, it's unlikely to be noticeable. If it wasn't seen before on prints you made, it won't be now.

Also, unless you shoot wide-open all the time, the variation in focus tolerance may disappear altogether (even if it is actually there).

You've gone from 6.1 to 16mp, so at 100%, lots of things may become apparent that were no issue before...

www.billkeane.zenfolio.com

brunohornbeck

US
5 posts

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#2. "RE: AF Fine Tune & D7000" | In response to Reply # 1

brunohornbeck Silver Member Nikonian since 29th Jan 2013
Thu 14-Feb-13 10:59 PM

Actually prints are what convinced me there was a problem. I shot a series of pictures at a church function & I just couldn't get the raw files to be as crisp as what I
used to get with the D70. I spent a week ruling out various problems & finally decided to get a couple of prints to see if I was imagining the problem. The prints confirmed that something wasn't quite right.

billD80

US
2241 posts

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#4. "RE: AF Fine Tune & D7000" | In response to Reply # 2

billD80 Silver Member Nikonian since 22nd Jan 2007
Thu 14-Feb-13 11:50 PM

>Actually prints are what convinced me there was a problem. I
>shot a series of pictures at a church function & I just
>couldn't get the raw files to be as crisp as what I
>used to get with the D70. I spent a week ruling out various
>problems & finally decided to get a couple of prints to
>see if I was imagining the problem. The prints confirmed that
>something wasn't quite right.

If prints convinced you there was a problem, then I'd ask was size the prints were... If they were, 8x12, and you saw something, then there must be a BIG problem.

Can you post a problematic image?

www.billkeane.zenfolio.com

jbloom

Wethersfield, US
7735 posts

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#5. "RE: AF Fine Tune & D7000" | In response to Reply # 0

jbloom Gold Member Awarded for the continuous and generous sharing of his high level expertise and his always encouraging comments in several forums. Donor Ribbon awarded for his generous support to the Fundraising Campaign 2014 Nikonian since 15th Jul 2004
Fri 15-Feb-13 04:05 PM

Aperture setting shouldn't matter.

While the -5 may not be exact at other focal lengths, chances are good that it will be quite close. The zoom lenses I've calibrated on my D7000 were all pretty close at both ends of their range when I set the AF fine tune using a focal length in the middle of the range. I don't have any really wide-range lenses (e.g., 18-200), so those may be more problematic. But my 18-70 and my 24-70 f/2.8 seem both seem pretty close after calibration (-8 in my case).

Here's a procedure that makes it easy to check the AF fine tune value:
http://forums.dpreview.com/forums/post/50774257

If you verify that procedure at your calibrated focal length of 45mm, then at each end of the lens' focal length range, you'll probably be able to put your mind at ease.

-- Jon
Wethersfield, CT, USA
Connecticut High School Sports Photos

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km6xz

St Petersburg, RU
3577 posts

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#6. "RE: AF Fine Tune & D7000" | In response to Reply # 0

km6xz Moderator Awarded for his in-depth knowledge in various areas, including Portraits and Urban Photography Nikonian since 22nd Jan 2009
Sat 16-Feb-13 07:59 AM

Post processing methods will have a big impact on apparent sharpness. Assuming the -5 captures the sharpness of focus you were expecting, it will probably be ok for other focal ranges as well.
It must be noted that Nikon had default sharpening of D70 higher than cameras beginning with the D90 which required boosting sharpness for JPG images which means that additional sharpening is also needed in rendering RAW files. Any sharpening set in your Picture Controls will be seen in the rendering when using Capture NX2 but not with other brands of editing software.
If you are satisfied that the subject is in focus with your -5 adjustment, adjusting the sharpness and contrast from the default settings will make the images sharper and more dramatic in the prints.
Re-sizing the image for print also impacts the apparent detail and resolution depending on settings on during the resampling process to convert large files to smaller prints. When given the choice of sampling select Bicubic.
If you post an image we might be able to give specific suggestions or experiment with the image ourselves to improve the print appearance.
Stan
St Petersburg Russia

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brunohornbeck

US
5 posts

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#7. "RE: AF Fine Tune & D7000 - Thanks" | In response to Reply # 6

brunohornbeck Silver Member Nikonian since 29th Jan 2013
Sun 17-Feb-13 05:00 PM

It does appear that the correction applied is effective enough at other focal lengths. It also appears to be a lens problem since my 70-300 does not appear to need correction. I take that to mean that the problem is not in the camera body. I filtered out most of the variables (post processing, etc) by mounting the camera on a tripod, shooting at various focal lengths while focusing on carefully selected spots, and then viewing in Capture at 100% without modifying settings or resizing from shot to shot. While it would appear that the correction was small the difference in the pictures was apparent. Being a noob I am not familiar with posting pictures so I haven't tried to tackle that too, at least for the time being.

Your suggestions and comments were both helpful and appreciated.

Now I can return to determining how to set the camera up in general.

"I'm not too bright, but I make up for it by being stubborn."

hnagy

Cairo, EG
33 posts

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#8. "RE: AF Fine Tune & D7000 - Thanks" | In response to Reply # 7

hnagy Registered since 02nd Feb 2013
Mon 18-Feb-13 05:37 AM

Yes, how can we post a picture to Let the rest judge it here?

TheDraftsman

middlesex, US
111 posts

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#9. "RE: AF Fine Tune & D7000" | In response to Reply # 0

TheDraftsman Registered since 20th Jan 2011
Mon 18-Feb-13 01:01 PM | edited Mon 18-Feb-13 01:01 PM by TheDraftsman

You are not going to get the sharp photos you want with the D7000 and
that kit lens inside a church. Been there. You need faster shutter
speeds with the D7000. And Nikon isn't big on advice for fine tuning
zoom lenses. Uping your shutter speed does more that what you think
you are seeing fidding around with fine tuning a zoom.

cwils02

HIXSON, US
826 posts

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#10. "RE: AF Fine Tune & D7000 - Thanks" | In response to Reply # 8

cwils02 Gold Member Nikonian since 18th Apr 2012
Mon 18-Feb-13 07:29 PM

Reply to some post on here, this one if you wish. There is the big box that you type in. Just below that is a thinner box with an orange link to click on to "Click here to choose your attachments"

Follow the instructions (Pay attention to the restricted size) click on close window. Then it's a good idea to preview before posting.

BTW, this comes straight out of the camera just modified for size.


Click on image to view larger version


Attachment#1 (jpg file)

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cwils02

HIXSON, US
826 posts

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#11. "RE: AF Fine Tune & D7000 - Thanks" | In response to Reply # 10

cwils02 Gold Member Nikonian since 18th Apr 2012
Mon 18-Feb-13 07:39 PM

Does that mean it isn't a 100% crop?

Charlie

If I understand what a very patient Nikonian tried to tell me, that is correct.

And, just to be clear this isn't from a Nikon either. I found it yesterday in an old camera that hasn't been touched since one junk photo in 2009. This one was taken in 2007. The EVF wasn't working, but everything else did. The on camera clock was right on, even though the battery was way dead.

Just wanted one to upload so that I was sure to explain correctly how to upload a photo.

Charlie

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cwils02

HIXSON, US
826 posts

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#12. "RE: AF Fine Tune & D7000 - Thanks" | In response to Reply # 11

cwils02 Gold Member Nikonian since 18th Apr 2012
Tue 19-Feb-13 04:00 AM

Just slid the proper control & Voila! The EVF is working.

Visit my Nikonians gallery.

G