72mm diameter achromatic diopter for M35

[Martin Amada]

I have a custom built M35 cine-adapter which I use with my SONY Z1U and a set of Carl Zeiss lenses. A cheap 60mm dia. achromat which I bought and mounted in an aluminum ring, screws into the camera's threads. I am getting pretty good results but there is a little softness at the edges of the images.

 

I believe that by replacing the achromat with one of three better ones; either the Century Optics (now Schneider); Cinevate (Brevis) or Redrock's 72mm diameter achromatic diopter, I may get better results. Can anyone recommend one of these for use with a Z1U?

 

Thanks,

Martin