Assertion: photographic lens | /r/CreatedBy | sigma
Facets:
value: currently
type: TEMPORAL
Source sentences:
text: F-mount photographic lenses are currently made by Nikon, Zeiss, Voigtländer, Schneider, Sigma, Tokina, Tamron, Hartblei, Kiev-Arsenal, Lensbaby, Vivitar, and others, and over 400 lenses are compatible with the system.