Nexus EOS 5D

I have used this housing extensively. I use the Sigma 20mm f1.8 with the Nexus 160 glass optical dome and a 30mm extension ring.
Without a lens diopter I can focus as close as 3 inches in front of the dome. I also use that Canon 100 macro in the nexus macro port which can also use the external CL90 macro lens adapter. I use the Ikelite DS160 strobe and Ultralight arms. I have the Inon 45 degree finder on the housing. The Nexus 5D with the dome port has perfect balance. Never had any problems with this for the last 3 years.