I saw a picture of one once. f/0.95 Take that Canon -Na - Na - Na…
I scored this puppy a buncha years ago, probably from Crutchfield.
Really nice for snapping pix around Christmas time for Christmas light displays and such.
https://www.kenrockwell.com/nikon/50mm-f12.htm
It’s tough for me to focus it manually, as when focus is so tight, it’s easy to screw it up. Too easy.
Eg, I used to use my 70-200 f/2.8 to get a nice tight DOF so that one of my favorite pix of one cat who used to come around, I got a “portrait” where the focus was on her eyes, and even the little hairs on her nose and forehead were already slightly blurry, so that drew your attention right to her eyes. Easy to do with autofocus by just bapping the focus point there and letting the camera do the heavy lifting.
Especially something opened way up to f/1.2 and an even tighter DOF, trying to get a good manual focus is trial and error, and lots of it. Tiniest bit “off”, and your focus is on her nose or eyebrows.
At least with nighttime shots of Christmas lights, each light is essentially a point-source, and far enough away, that it’s easier to focus manually.
The old split screen focus or matrix screens in the manual days were way easier to grab a sharp focus with a manual focus lens. I swear the screens were brighter back then too. Or maybe my eyes were.
Nikon made something called a sports finder for the F bodies. Had one on my F after the FTn finder meter died.
Huge eye opening. Like bigger than the size of a postage stamp. And huge eye relief. That old 120mm and a few rolls of Tri-X and I was ready for my high school sports coverage.
I’ve got an 80-200 screwdriver lens. Great lens. Got it to replace one of those 70-210 Vivitar S1 that was great but got stolen.
Got a Tokina 24-200 that makes a great travel lens on a FF. And along with a super wide zoom makes my crop camera ready for anything.
All the Best,
Jeff
Depends on the camera. I have an actual film camera, Olympus, that had a nice bright screen when looking through the viewfinder. I was interested in the Pentax Ksomething, and I’d swear I was wearing sunglasses, as the brightness wasn’t nearly as, well, bright.
Haven’t used the Olympus in decades, so if anyone wants a camera, lenses, bellows(!), etc., lemme know. 
I use a nikon d750 with the pro-grade lens 24-70mm f2.8 ED VR. In terms of image quality it beats the tiny sensor and fixed lens combination of a mobile camera or a compact point and shoot stle of camera. A large (35mm or apsc) sensor paired with good quality glass gives professional grade result.