Riddle me this..one twin in focus, the other not so much..

Started May 22, 2012 | Discussions thread
John Bean (UK)
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Re: Riddle me this..one twin in focus, the other not so much..
In reply to Adam Rogers, May 22, 2012

Adam Rogers wrote:

I was at my twin boys' school last week for an event and grabbed the NEX 5n + 50mm f/1.8. I snapped a few shots of them in class. This one was straight on from 8-10 feet away. Taken at f/4 I figured my plane of focus was easily 15-20 inches.

Hmm. I'd say it would be more like 12 inches (at a stretch) and for portraits you don't want to be at the extreme of acceptable DoF, you want the eye(s) bang on the plane of focus.

If you look closely at the full size image (link below), you can clearly see that my son on the left is out of focus even though he appears to be on the same plane and certainly within 15-20 inches of the focal plane.. how do you explain this?

Hard to say. Perhaps the difference is greater than it seems; a few inches is all it would take to produce this result.

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