On May 8, 2021, the group of Polish radio amateurs: Marek SP4ELF, Jurek SP2GUB, Adam SQ2DOL, Piotr SQ4MIK, and Jarek SQ4IOB realized optical communication (481 THz) between the locators KO04nd40DA and KO04fi31GV for a distance of 50.018 km. So they have broken the magic limit of 50 km!
Congratulations!
Read more on:
http://mikrofale.cafe/showthread.php?tid=248
https://pk-ukf.pl/optyczne-qso-na-odleglosc-50km/
Cover picture: https://pk-ukf.pl/optyczne-qso-na-odleglosc-50km/#iLightbox[gallery5661]/0
Thank you Zbyszek SP3NYF on information!