Quote Originally Posted by Satinsnow

Focal length equates manification, which in shooting the same subject at the same distance you will have less depth of field, one other way to increase magnification is macro extention tubes, or special close focus designs, which will also yield less depth of field, which of course is a different subject.

Dave, I didn't know you stood rooted to the spot and used a zoom lens ...

But seriously and all kidding aside, do the arithmetic. The results may surprise you a little. That a short lens can, in special circumstances, give more DOF than a long one in the equivalent final print was a surprise to me.