Originally posted by LesDMess I bought the cheapest adapters I could find labeled Fotasy and so far so good.
Assuming have to be in live view since it won't have the mechanical linkages. So the full frame A9 DSLR doesn't have the metering limitations as the other brands do when using the older lenses in aperture or manual modes?
None of the adapters I use have mechanical linkages, so you operate all the lenses manually. That can be a problem with auto-only M42 lenses, which require a modification to keep the diaphragm pin held down (on some lenses, it's an easy mod - on others, trickier, but doable). Pentax lenses with no aperture control ring (newer DA and D FA models) need an adapter with manual control of the diaphragm lever, and that works, but only in a fashion - it's not ideal.
Since the A6000, A7 and A9 are all mirrorless cameras, they're always effectively in Live View. The technique you use for focusing is to open the lens up to maximum aperture, then when you're ready to shoot, close it down to the required aperture. Metering is generally very accurate on all of these cameras (indeed, it's good on most mirrorless cameras I'm aware of, since they're metering off the sensor).
Does that answer your question?