I just spotted this on the FLO website, apparently some Baader OIII filters are producing halos around bright stars.
http://www.firstlightoptics.com/blog/product-recall-baader-iii-85nm-ccd-narrowband-filter-2458453.html (http://www.firstlightoptics.com/blog/product-recall-baader-iii-85nm-ccd-narrowband-filter-2458453.html)
Yes I had read about that, I think they Baader are happy to replace them.
Carole
First Astronomik now Baader, hopefully they can sort it out quickly and it doesn't tarnish their image like I think it did to Astronomik.
Robert
I have 2 Baader Oiii filters one in each wheel. I have checked the one in the EFW and that seems to be OK, must check the one in the manual wheel and see what that produced but I bought that one 2nd hand, so not sure if they would take it back if there was a problem.
Carole