Hi Grant,

Forums Comets C/2020 F3 (NEOWISE) Hi Grant,

Bill Ward

Hi Grant,

I was perusing this thread looking for another comment when I saw your question, apologies for the late answer…

The filter was a HOYA HMC circular polariser and yes it’s just an ordinary photographic type as recommended for DSLR’s using autofocus. 

It was a fun experiment. Nice to see a bit of theory in practice!