The optics currently available from Thüringen and environs are not that numerous, so DDR will do as "east". Askania , Jenoptik and Docter, even the Meyer works at the border with Poland are long gone.
So what remains to be discussed are the various antiques made in an age with little low dispersive glas, lots of traditional precision mechanics and fewer accountants and marketers (-which contributed to their demise whn the Treuhand regime struck).
However, some of the products remain fully usable. I am particularly fond of the "bauhaus" design of the Werras before their stripy period and the results from some of the last VEB-Zeiss optics. Examples that come to mind are the 20mm2,8 and version III of the Zeiss "pentacon" 300mm f4.
p.