Technically, it's possible. How much you got, how good's your tripod?

There's been über fast teles been made, faster than what we get now.
The soviets made a 125mm f/1.5
Killfitt/Zoomar made a 75/1.3, 180 f/1.3, 240 f/1.2.

Those were all back in the 60s to 80s, manual focus and all. Then take into account that the Zoomars covers 6x7 (that 240mm link is on a Pentax 67 body, it's about the size of a 1DX give or take). The image you get on a 6x7 photo is like putting a 102mm f/0.5 on a FF dslr. The Jupiter even covers 4x5", that's a FF equivalent of 30mm f/0.4.
Even by mounting, say, that 240mm f/1.2 on a FF DSLR you're going to have trouble focussing, you'll have to set your tripod in concrete or vibrations might muck your DOF.

Then imagine making one of them today. Putting in AF, imagine the size of the elements that you'd have to move to AF. Put in IS, that's more lens elements to move. That 240mm f/1.2 is going to have the same size elements as an 800mm f/4.0 (just not as long barrel). If you think that the 800mm is a huge and expensive lens, a 240 f/1.2 is going to be a lot worse, and not that many people can afford a $30k 20kg lens...