Does there exist such a thing? I have the Nikon 65mm f4 SW lens, and its filter thread does indeed appear to be 70mm, falling inconveniently between the normal sizes. So currently it's the only lens I don't have an orange (my favourite) filter for.
Thanks everyone - yes it IS a 67mm thread (I got all confused by the outer diameter - yes, I once completed an engineering degree, sigh...). Shane, I am using that on the Wista, and it works well, but with a normal lensboard, doesn't allow too much movement. A bit... but not much. I was pleasantly surprised though, and it's a sharp and easy to focus lens (f4!!). You should get one for your Wista