Does anybody know whether anything about differences between film now and in '39 in terms of what was the standard? Was it a 100? I'm using a b/w TX 400 at the mo but seeing as the aperture only closes down as far as f12.5, even if I go up to the fastest shutter speed I get the feeling I'm going to have a whole lot of very thick, if not entirely black, negatives.
I find that a very useful accessory is a x4 neutral density filter. I normally use ISO 200 film and this is often too fast - the ND cuts it down to an ISO 50 equivalent which is much more manageable in sunlight but the option of the faster film is there when the light fades. Do buy a good filter though.