I have used various Sigma lenses on my Canon bodies. ALL of them have considerable free play after clicking onto the bayonet fitting. Recently I bought the Sigma 150-600 Sport for my Canon 7D Mk II. There is considerable play between the lens and camera when fitted but this does not seem to effect the quality of the pics. Is there a solution to this? Members of our club who use Sigma on Sony and other cameras all have the same problem.