Clamshell OTA Rings

Who (beside Socal and Parallax) manufactures high quality OTA clamshell
rings? I know there is at least one more company that makes good rings,
but I can't remember its name and Google hasn't helped.

I'm not looking for companies like Tele Vue or Takahashi, who make
rings that are intended to be brand-specific (even if they might fit
other brands.)

TIA

Davoud

--
usenet *at* davidillig dawt com

Try [Registered users can see links. ] .

Merry Christmas,
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