I notice that the fastest setting on the iiif's film speed dial, (which is only there as a reminder, there are no automatic settings to be affected), is 125 ASA, the slowest is 6. So film must have been overall much slower back in the 1950s.
This is perhaps why slow shutter speeds have their own wee dial. And why the tripod socket is almost directly below the shutter button - which is so obvious a place for it to be, when you think about it. Also, the tight fit in one's hand if you're not using a tripod, will make shake less likely at slow speeds.
The bottom line is, with, say Fuji Neopan 1600, you've got a whole load of scope in low light.
I'm using up odds and sods of colour film out of the fridge, just around the house, to take into Snappy Snaps on Monday morning, see if it's all been working. And then I'll start on black and white DIY through the week.