Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Will not work with Canon EFS Lenses

The Tamron teleconverters will not work with Canon's EF-S lens line for cameras with APS-C sensors. The Canon lens will not mount on the teleconverter due to the changed mounting configuration (white dot) on these lenses. The Tamron teleconverter works as advertised with full frame (EF) lenses.