Assertion: lens's mm | /r/HasProperty | f/1.0l usm
Facets:
Source sentences:
text: USM is a professional L series lens designed to replace the EF 50mm f/1.0L USM.
text: In 1989 Canon was the first to create an f/1.0 AF (AutoFocus) lens with the Canon EF 50mm f/1.0L USM.