wrote:

You would do better to get a Hasselblad to standard filter thread
adapter, marketed by Kalt oh-so-many-years ago: googling just that I
came up with
http://www.lordofthelens.net/servlet/Detail?no=18 which gave me a site
which will sell you the beastie for a paltry $28

I don't know... they are cheap, but not very good either.

But whatever you do, don't buy the particular one the link leads to.
A 58 mm filter is way too small for bayonet 60 lenses. You need 67 mm
filters.