4. Use Apertures to Control Depth of Field
To get the most out of available depth-of-field, select a small aperture like f/16 or even f/22. You will find that at half-life size the depth of field you can achieve at f/22 will be only around 15mm at best. On the other hand you may wish to go to the other extreme and show as little sharpness as possible by opening up to full aperture like f/2.8 or f/4. One advantage of the latter option is that any out-of-focus highlights will show as circle-like bubbles that can look very attractive. Of the two snowdrop shots shown here the left image below was shot at f/2.8 while the one on the right was taken at f/22.