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New D7100 and focus

Andy47

Albuquerque, US
37 posts

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Andy47 Registered since 20th Aug 2011
Mon 20-May-13 06:52 PM

My D5100 was stolen so I decided to upgrade with a D7100. My problem is that photos of people are not sharp. For portraits, I typically focus on the eye, but the focus points on the D7100 are so large, I inevitably get a good part of the face. I don't know if this is the issue or not. I printed a focus chart and tested camera & lens. Sharp, both on the tripod and hand-held. I use only AF-S, single point of focus. I can't figure out what I'm doing wrong. If anyone has any thoughts or suggestions, please let me know.

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JosephK

Seattle, WA, US
7064 posts

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#1. "RE: New D7100 and focus" | In response to Reply # 0

JosephK Silver Member Fellow Ribbon awarded for his excellent and frequent contributions and sharing his in-depth knowledge and experience with the community in the Nikonians spirit. Nikonian since 17th Apr 2006
Mon 20-May-13 07:15 PM

Any chance you have an example photo with all the EXIF data that shows the circumstances you tend to find the problem in?

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Joseph K
Seattle, WA, USA

D700, D200, D70S, 24-70mm f/2.8, VR 70-200mm f/2.8 II,
50mm f/1.4 D, 70-300mm f/4.5-5.6 VR, 18-70mm f/3.5-4.5 DX

kuzzy

Milford, US
1301 posts

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#2. "RE: New D7100 and focus" | In response to Reply # 0

kuzzy Silver Member Nikonian since 12th Dec 2005
Mon 20-May-13 08:55 PM

I am not sure how the D5100 worked but with the D7100 AF-S mode, once locked on focus will not adjust for any movement. Try AF-C focus priority, that may solve your problem. You may just have a little movement by either the subject, yourself or both causing the problem.

Marc
There are always two people in every picture: the photographer and the viewer.-Ansel Adams

http://500px.com/WhatISaw
http://kuzzy.smugmug.com

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Andy47

Albuquerque, US
37 posts

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#3. "RE: New D7100 and focus" | In response to Reply # 2

Andy47 Registered since 20th Aug 2011
Tue 21-May-13 01:34 PM

Thanks, Marc.

I redid my focus test using the focus point on the far right of the viewfinder (camera on the tripod) and the focus was not nearly as sharp as when I used the center focus point.

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Andy47

Albuquerque, US
37 posts

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#4. "RE: New D7100 and focus" | In response to Reply # 1

Andy47 Registered since 20th Aug 2011
Tue 21-May-13 02:14 PM

Well, as usual the error is behind the camera. I looked back at yesterday's test shot and realized I had failed to keep the camera parallel to the target for my 'far right' shot, so I did it over again today and all focus points appear to be sharp. So, Marc probably had the answer when photographing people, use AF-C to mitigate movement. Thanks.

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km6xz

St Petersburg, RU
3559 posts

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#5. "RE: New D7100 and focus" | In response to Reply # 3

km6xz Moderator Awarded for his in-depth knowledge in various areas, including Portraits and Urban Photography Nikonian since 22nd Jan 2009
Tue 21-May-13 07:47 PM

What lens are you using? Most lenses fall off a great deal in resolving power at the sides compared to the center.
If the focus is off, something will still be sharply in focus, maybe not what you intended however. When corner softness is the cause, nothing is quite perfect.
Please post an image that demonstrates what you are getting so we can make suggestions.
Stan
St Petersburg Russia

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