The following is a communication from them and the email address is where the communication came from..

From: <r.schoenrock@dhw-fototechnik.de>
Date: Thu, Apr 28, 2011 at 10:43 PM

We are not allowed to use the name Planar. Therefore, we have changed the
name in S-Apogon. The material and the resolution of the lenses is still
the same.

Best regards

Reiner