I've just been reading Once is Enough by Miles Smeeton, a famous account of a Cape Horn attempt in 1956 by three in a 46 foot wood ketch. There is one or two surprises.
Once Is Enough (Sailor's Classics): Amazon.co.uk: Miles Smeeton, Smeeton Miles: Books
There are main references in the book to John Guzzwell shooting film in a cine camera during the trip, including from a dinghy towed behind Tzu Hang, their ketch. If you are curious, fair examples of that film are shown here:
ITN Reporting 67: Cape Horn: Sailing Round the Horn
It's a great book-- a classic.