Natural targets are assumed to be already imaged by a typical camera. That is they have blur and maybe a bit of noise. In other words they are not ideal. The program marks natural targets a bit differently as it does not need to solve for the amount of blur nor will it solve for large changes in size from the template. Some rotation, skew and small scale change is solved for but the freedom of orientation may not be the same as with ideal targets. They cannot be auto-marked but they can be tracked in a motion project (motion tools in PhotoModeler Premium).