>>3482506The lenses cost the same.
Sony e-mount lenses fit on all of those, just make sure to get Full Frame lenses, irrespective of the expense, not APS-C lenses.
a6400 is paradoxically better than a6500 (retarded naming schemes) since it came out
more recently than the a6500. Same specs but with a fully axiable flip out screen.
They are still both crop-* sensors* however, so cannot make full use of FF lenses.
This is why FF lenses will list an "Equivalent 35mm focal distance" which refers to the sensor size (carried over from 35mm film, not focal distance). Example, the Sigma 16mm f/1.4 prime I use on my a6000 has an "equivalent 35mm" focal distance of ~28mm since it would be as though you "zoomed in" to 28mm on a full frame.
The a7ii is a FF sensor body, and can only be used efficiently with FF lenses; APS-C lenses will introduce heavy vignetting on your image, or cut off corners entirely since a lot of the sensor is blocked off by what is essentially a smaller focal plane, despite the image being in focus.
