kshapero
South Florida Man
I have an M-A, M3 and a Nikon F (no meter). Why I deem them so important? Because using them teaches how to setup your metering by feel (you will get better at this over time), It teaches you in the beginning to guess exposure but you will get better at this with time, too. I can look at the top of my camera before composing and set the aperture, Shutter speed and even the focus before I even compose. Then I bring the camera up to my eye to compose the shot. Mostly use a 35mm lens. A very pleasurable experience.
I do "cheat" sometimes if I really am clueless about an exposure, I will whip out my iPhone to use an app called light meter.

I do "cheat" sometimes if I really am clueless about an exposure, I will whip out my iPhone to use an app called light meter.
