Quote Originally Posted by hoojammyflip View Post
yep, referring to the common 4 group 6 element design of Nikkor 50/2.8N or componon S 50/2.8 etc
That is the double Gauss design as used in the 50/1.8 Zuiko. You'll find them with 7 elements too, the 7 element f:1.4 Zuiko is also a dG.