There was a time, not quite so long ago, when film photography really was the Golden Age of Photography and it was so alive and cool.
Fujinon XF 56mm F1.2 and Helios 58mm F2.0 are my 2 main prime lenses for portrait photography (sometimes I use another manual focus lens, the Pentacon 135mm F2.8), when used with a Fujifilm X mirrorless camera. I know many of the Fujifilm users do not have the 56mm prime lens for portraits, but instead, some of them use old legacy manual focus lenses as a cheap and accessible alternative.
The word “Bokeh” actually comes from the Japanese word “boke” ボケ, which means “blur”. The “h” at the end was added to emphasize on the correct pronunciation by the English speakers. “Bokeh” refers to the quality and aesthetics of the blurry parts (out of focus areas) in an image, taken by a photographic lens. It is not something you could really mathematically measure, or quantify, but more of an aspect which relates to photographic artistic principles.
About manual focus lenses, there are quite a few articles on the internet, to help you understand what this is all about and how to choose your ideal setup for your camera.
Some folks asked me what do I carry in my bag, when I have a photography assignment. Well, I said it would be nice to write down my “things” I take with me in my photo bag.