Lack is the opposite of Possess. Possess is related to Property. Property is the opposite of Public. Public is related to Group. 
Camera is related to Machine. Machine can be Mechanical. 
Lack <--Antonym--> Possess <--RelatedTo--> Property <--Antonym--> Public <--RelatedTo--> Group 
Camera <--RelatedTo--> Machine --HasProperty--> Mechanical 