Symbol 5579 from IEC 60417 - Title/Meaning: Zone focus, middle distance Function/description: To identify a middle focal distance.
Additional information: 
This symbol is to be used in conjunction with one or more of symbols 5577, 5578 and 5580
Minor editorial improvement agreed by the Change Request was reflected after the release on 2002-10-07
Published in: Supplement M, 1994
Own work using: iso.org/obp/graphics/grs/135c52a4-25d0-4ff7-9b86-8b02a8a4d5eb 200.png
Vectorization:  Mrmw