source: The final model was the top of this sector, the Canon FT QL, which was developed to combat the growing popularity of the Pentax Spotmatic variants as well as the Topcon RE SLRs.
target: The final model was the top of this sector, the Canon FT QL.  It was developed to combat the growing popularity of the Pentax Spotmatic variants and the Topcon RE SLRs.
references: The final model was the top of this sector, the Canon FT QL.  It was developed to combat the growing popularity of the Pentax Spotmatic variants and the Topcon RE SLRs.