Filter Holder-  3 positions A , B, or none

This design is a manual shuttle and holds 2 filters in the shuttles.  One can be fixed in the nosepiece.

Body of holder is machined from 6061 aluminum.  Filter holder/ shutters machined from black Delrin.
Finished Machined Parts

Ready to assemble with Ha filter and OIII fillter in place
Changer Assembled
Changer mounted on TV-85

Changer thickness designed to give correct focal length for .8x reducer