If you are using targets (RAD targets, coded targets, dots, or templates), you can use the sub-pixel target marker to quickly and accurately find the center of the target. Accurate marking like this ensures that the exact center of the target is found and marked in each photo.
With the sub-pixel target marking tool, drag a region around the entire target (around the outer ring for RAD or coded targets, or the dot for non-coded targets). When you release the mouse the centre of the target will be marked very accurately.
See also Targets - Do’s and Don’t’s, Coded Targets, Sub-pixel Target Marking, Marking Points, Automatic Target Marking.