Canon 5d Mark iii Help with focusing

Started Jan 20, 2013 | Discussions thread
Senior MemberPosts: 2,805
Re: Canon 5d Mark iii Help with focusing
In reply to Nigel Wilkins, Jan 20, 2013

Nigel Wilkins wrote:

bhollis wrote:

Nigel Wilkins wrote:

If one person is in focus & others aren't, you need more depth of field by adjusting to a smaller aperture, say f/11 instead of f/2.8. If that's not an option, you can use a shorter focal length (& stay where you are) or step back from your subjects, reducing magnification.

F/11 is almost certainly going too far the other direction.

How do you know?

Take a look at a depth of field caculator.  I think you'll find that f/11 is more of a landscape aperture--where you want everything from a few feet to infinity in focus.  Very unliklely you'd ever need that kind of depth of field for a group portrait.

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