Assertion: party lens | /r/HasProperty | manufactured by sigma
Facets:
Source sentences:
text: Third-party lenses compatible with Canon's EF and EF-S mounts are manufactured by Sigma, Tamron, Tokina and Zeiss.
text: Compatible third-party lenses with the EF lens mount are manufactured by Yongnuo, Samyang, Schneider, Sigma, Tamron, Tokina, and Carl Zeiss.