Tw other questions are:
Infinity with adapters is mostly a liitle past infinity, especially if you start using two adapters on top of each other.
If I try to think logically with my limited tech brain I would think this is not a problem for the Techart adapter?
Did you use one of the latest Sony camera models? Because, as Vivek stated on the old models the focussing is like a snail and I didn't
hear you complain about focussing speed.