I suggest you shoot 800 film. Shoot mainly at 400 (ie +1 stop) and go to 800 in a pinch. Push the film if you have to.
The problem is not your handholding ability, but the movement of the subjects. You'll need to shoot f8 or f11 to get the depth of field, but you don't want to keep telling them to hold still. A rangefinder like the Mamiya should not interrupt the flow of events.
I've not used the 150 lens much, only at the zoo. It's a great lens, but takes a long time to focus.
You'll have to plan your lens changes carefully, because it takes so much time to activate the light shield and make sure you don't drop a lens while changing. For this reason I'd use the 80 and zoom with my feet when possible, and the 50 mm when in the midst of things.
Originally Posted by firstname.lastname@example.org
Thanks for the answers all. Actually, I have a DSLR, and I feel I'd be faster with the M6. I still think manual aperture adjustment on the lens is much faster (for me) than digital adjustment.
two more questions:
1. Has anyone used the 150 lens for weddings?
2. What would be your preferred film for the M6: 160 or 400. And for color negative film, especially if there is any scanning, do you shoot at box speed, or do you over-expose a bit?