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[Rollei] Opton vs Planar (was 6-element planar?)

Dear all, 

Would it be possible to please enlighten a newbie on the difference between 
a Planar lens vs an Opton lens? I mean, is this just a difference in 
name/trademark/whatever, or is it just two VERY different lenses, different 

Thank you very much in advance. 


Q.G. de Bakker writes: 

> There were some some number blocks put aside by Zeiss for prototypes and
> special/experimental lenses, and for the OPTON lenses exported to the East
> Block. These serial number blocks were 2,58x,xxx and 2,59x,xxx. The new
> 2,72x,xxx block had to "jump" these blocks too.