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D7100: AF focuses on background a lot?


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kuzzy

Milford, US
1301 posts

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"RE: D7100: AF focuses on background a lot?"

kuzzy Silver Member Nikonian since 12th Dec 2005
Wed 08-May-13 01:51 AM | edited Wed 08-May-13 01:55 AM by kuzzy

Neil, The latest version of View NX2 is 2.7.5. I had an older version on my computer and tried to view the NEF's and got the same message. You probably just need to upgrade your copy as I have since done and they now are working just fine.

The focus points are visible on the 3 NEF's I downloaded, 0404,0405 and 1009 (also just did 0517). I really had a hard time understanding 1009 until I just looked at the RAW image and looked at the carpet. It would appear that the carpet on a plane with the focus point, the drummers mid section, is in focus and not the table leg behind him as it appears at first blush. Looking at the carpet it looks like focus was much more accurate than originally suspected. Unfortunately there are no similar reference points to look at in the other images so it is more difficult to say on those. I believe that most of the issue here is caused by 24 Million tiny little pixels as opposed to 12 million in the D300. The extra pixels add more resolution both good and bad. I believe what you see is motion blur from the drummer moving with a shutter speed of 1/100. I would tend to agree with Omari that he does not have a backfocus problem or a problem created by less than perfect hand holding technique at these rather slow shutter speeds.

I think some controlled testing is the only way to narrow this down.

Your stop sign test is a good idea for locating the sensors. I have thought that my D7000 is off on the right side of the center focus point in particular but I have not had the inclination to try an elaborate test. Your idea sounds simple and it should give one a pretty good idea of exactly where the sensor is. Thanks for the idea.

Omari, some nice street shots on you blog. I really like the reflection shot.

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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This is a hot topic  It has been locked by a team member D7100: AF focuses on background a lot? [View all] , doppler_fto , Fri 03-May-13 05:19 AM
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