As per the title - now surplus to requirement Askar D1 filter.
I paid $485 for it in February 2024.
Sell for $300 - posted anywhere in Australia.
I've pointed this thing a some incredibly bright stars and never seen a halo anywhere, the optical quality of the filter is superb and it has been used to create some of the best images I've ever made.
Eta Carina (Synthetic SHO)
M8+M20 (Ha+R)G(OIII+B)
NGC3576 (Synthetic SHO)