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D7100: AF focuses on background a lot?


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nrothschild

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

nrothschild Neil is an expert in several areas, including camera support Registered since 25th Jul 2004
Wed 08-May-13 05:24 PM

Good point, Pete. At 19.5 foot working distance (per the EXIF focus distance) and f/2.8 at 70mm, the DOF is 12 inches behind and 13 inches in front of focus. Raises questions.

The 70-200 was shot with VR *off*, per the EXIF. The 1/100s shutter speed is marginal per the general 1/fl rule of thumb, adjusted for DX but applicable only to screen size viewing, not drilling into the image.

So there are potential issues of camera shake, subject motion, and even DOF here. That is why I suggested that "stop sign" test. Which would hopefully be done in bright light within 2 stops or so of sunny/16, at lower ISO and reasonable shutter speeds.

_________________________________
Neil


my Nikonians gallery.

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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