1. A rangefinder for determining a distance between a shooting device and a target, the shooting device including a sighting mechanism for aligning the shooting device to the target, the rangefinder device comprising: a housing; a mounting apparatus attached to the housing structured to mount the rangefinder on the shooting device, the mounting apparatus including a connector by which the rangefinder can be mounted on the shooting device and adjusted relative to the shooting device after mounting in a manner that is separate from aligning the sighting mechanism of the shooting device to the target; and an alignment mechanism on the rangefinder and configured to align the rangefinder to a fixed sight of the shooting device, the alignment mechanism including a visible laser configured to illuminate the target, and the visible laser controllable by an operator to be turned on and turned off.