I just discovered the joy of the AE-L button on the cameras above, geez what a help with manual lenses. Had read the manual, but never given the button much thought till I was doing some reading on the net.
Put the camera in M mode, switch to manual focus, adjust your apeture, set focus, press the shutter button half down and while the meter is on, hit the AE-L button.
It stops down the lens, takes a light reading and holds the setting till the shutter button is pushed .. great results nearly every time ...fantastic !
Beats mucking about taking 101 shots trying to get the right shutter speeds etc.
I love it, had every manual lens out that I have today and results are excellent....