Purchased from Teleskop Service in 2019.
This is a fantastic light pollution filter. It produced excellent results from my backyard in south west Sydney. Includes Canon adapter.
First Light Optics describes it as: " the BEST Light Pollution Suppression filter for astro photography with DSLR, colour and mono CCD cameras."
https://www.firstlightoptics.com/lig...-c-and-rp.html
Cost me $389 (including shipping from Europe). Will ship to you for $250.