After adding a ZWO filter holder to between my DSLR and Skywatcher 200PDS my excitement was crushed when I found the focuser would no longer go in far enough! I remembered seeing this when shopping for my original T-Ring and thankfully FLO had one in stock for me to try. It does seem a bit expensive just for a T-Ring, but on the other hand my setup wouldn't work without it. I've now gained back around 10mm of focus and still have some room to spare even after fitting the filter holder. Look forward to trying it out more IF the weather ever improves!

Precision built. Comes with handy tool to release .