1. Original DA18-55 - 12 Elements in 9 Groups, One Aspherical Element:
2. DA18-55II - 11 Elements in 8 Groups, One ED (Extra Low Dispersion) Element:
3. DA18-55WR - 11 Elements in 8 Groups, One Aspherical Element and One ED Element:
4. DAL18-55 - 11 Elements in 8 Groups, No Aspherical nor ED Element of