Help

[mckelver]

I have a Canon 5D with 28-105 lens I have been using and am struggling to capture pictures of 6 kids together and everyone being in focus. Any suggestions on what I could be doing wrong?

[PhotosGuy]

Generally, If you focus on a given point, DOF extends from 30% from that point towards you to 70% away from that point at "normal" distances. For close-ups, it's more like 50% & 50%.
DOF depends on the distance AND focal length of the lens AND the f-stop. So there isn't any "rule of thumb setting" until you standardize two of the variables?

Depth of Field (http://photography-on-the.net/forum/showthread.php?t=306018)

Depth of field and aperture selection question. (http://photography-on-the.net/forum/showthread.php?p=2407876)

Dof question (http://photography-on-the.net/forum/showthread.php?t=304395)

Depth-of-field Calculator
Depth-of-field (http://www.cambridgeincolour.com/tutorials/depth-of-field.htm)

Another DOF calculator at…
http://www.rbarkerphoto.com/DOF2.html