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 Any:
After all, it seems that the optical formula and construction of the DA18-55WR should be the best. On the other hand, the optical design of the DAL18-55 is a cutting corner one, which should perform worst. Not even to mention about the cutting corner build of the DAL, which adopts a plastic mount and the quick shift focus mechanism is removed altogether.
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