"Since Vivitar came back with the standard answer that they are not infringing, I assumed that I would have ample time to return to EDIG. " BL

You might but their language is not an indicator of much, imo.  Look at the recent Apple actions, filing a counter suit against BRST and then settling a few weeks later.  It's all sabre rattling.  After all, what did we expect their lawyers to say when faced with DM's first strike?

Good luck on your investment strategy.  I hope they both run.

BTW, so it was you who drove our pps down....lol.