| Ive used A series lenses and M42 Mount lenses, and to address the issue of workflow, here's what i have to do with each.
A lenses: Set camera to Av mode; choose aperture as you normally would in-camera; focus; shoot.
M42/Non-A lenses: Set camera to M mode; focus; turn aperture ring to desired aperture; meter using green button/AE-L button; shoot.
As you can see it really is only one extra step, but in fast paced situations with varying light conditions, I wouldn't feel comfortable wasting any extra time. Once you get really proficient at it, perhaps it could be workable, but personally I would stick with A lenses if I were doing something like a wedding.
For personal use or shoots where you can take your time, M series lenses and older are fantastic, especially build quality |