=== Notes ===
*Although brass is used to create the [[protractor]], and bronze is used to create the [[sight]], the finished dioptra tool is bronze and is therefore improved with [[bronze lump]].
*Quality of dioptra affects how long the planed planned bridge may be.
*The maximum distance in metres between planner and helper is quality x 1.6, as an approximation for the number of tiles it is quality x 0.4, but as its almost impossible to stand on the tile borders its best to add 1-2 quality
*The dioptra has a relatively high value and is worth the same as, for example, mooring ropes and door locks of equal quality. [[Get price]] = QL^2 * 0.50.