Hi. I am looking to get into LF photography - almost certainly 4x5. I prefer shooting people (wouldn't say portraits) than landscapes or architecture. I find all the options out there confusing, but what I know so far is that I would like some level of portability and some ability to use longer lenses (probably nothing over 300, but ...) and also 6x6 backs if possible.

What I don't understand is why people don't think that a rangefinder is a big deal for LF photography. Is the ability to continue to focus or adjust framing after you have insert the film not important or do rangefinders / viewfinders just not work that well with LF cameras/photography. Isn't it a problem if your model or whatever you are shooting moves slightly and you lose focus?