Hi I have a CFW-8A filter wheel with filters already installed that was purchased from OPTcorp. The 1.25" mounted filters do not have any markings on them as to what brand they are. DO you know who they were made by?
That would be a little hard to tell. Probably Baader or Astrodon. Astrodon's tend to be very reflective on one side. Other than that OPT should know. Regards Tim