[davidmanze]

You understand testing super tele lenses requires the test char to  be very  far away from camera, with a 800mm lens it probably has to be done outdoors unless Klaus owns a big palace, so 800mm isn't his preferred focal lens for testing

 
......... no worries ... this is Australia ...... they don't have size problems ........

..... look at the prawns !
...........................................

Anyhow back at the "800mm F11" lens ranch ....... how is focusing going to be with BIF at this relative pin hole aperture on an R camera??