I have some old Sigma/Tamron (Minolta-mount) lenses as well as Kyocera/Yashica lenses (35-70mm f/?? and 70-210mm f/4.5). Does anyone know if these can be mounted on Canon/Nikon body via adapter (and roughly how much would the adapter cost if it's available)? One alternative for the Minolta-mount would be to just buy a Sony Alpha second-hand, right? I assume for these options, I'll only have manual focus? including the Sony Alpha?