5 are nice, but went obsolete back in the early 1990s when they were replaced for portraiture by the DC lenses. Since few people outside of Japan understand what the DC lenses do, I don't know that any other than the most savvy pros know about them.
The Sigma lenses appropriate for small-frame sensor cameras are denoted with a "DC". You can use DG lenses on crop sensor cameras but you can't use DC lenses on full frame cameras without vignetting.
 See also: APS-C, Sensor, Stops, Professional, Photograph
  
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