I have a lens with a standard 95mm thread and have been using threaded filters of that size till now.
I would like to expand my filter selection and hope to use the 4" filters available from HiTech and others. I have not purchased filters or filter holder yet (considering HiTech MK4), but it seems that the holders (and their respective adapter rings) do not adapt to larger than 85mm lens thread. In fact, I'm thinking that the circular opening on the holders may well be under 90-95mm. Could someone provide an actual measurement ?
It looks as this may require some home brewing. Also, any thoughts or suggestions on the above as well as experience adapting 4"x4" filters to a lens of my size will be most welcome.
Thanks very much in advance.