hi all.
This is another of the newbie questions and am sorry if it has been covered before.
could someone tell me how I would use these types of filters please.
have seen loads of pictures and know the advantages of using them just I don't know how!!

thanks Ben.
This is another of the newbie questions and am sorry if it has been covered before.
could someone tell me how I would use these types of filters please.
have seen loads of pictures and know the advantages of using them just I don't know how!!
thanks Ben.
