1. A calibration apparatus for use with a storage system for storing a plurality of objects in an array of object storage locations, comprising: an object retrieval mechanism for retrieving objects from said object storage locations; a calibration block moveably attached to said storage system, having at least one nesting feature for engaging a portion of said object retrieval mechanism and having a target; and an imaging system attached to said object retrieval mechanism for capturing an image of a portion of said target for use in calibrating said object retrieval mechanism.