A7R+TS-E 24: Internal reflections in Metabones III adapter and what could help

[achrisproduction]

I tried to visualize what happen's with that combination. Section unshifted and with full shift (see below).
With its image circle of 67mm the TS-E hits a lot of surfaces inside the metabones that can reflect. Maybe the rear element of the lens reflects back to the sensor.

Hi Marc, great post!  now that metabones has released the Mark IV version with a bigger inner hole but still it seems the corner performance of tilt shift lens on it is poor.

http://www.iso72.de/metabones-sony-nex-smart-adapter-mark-iv-vs-mark-iii-sealed-comparsionreview/

[David Eichler]

Hi Marc, great post!  now that metabones has released the Mark IV version with a bigger inner hole but still it seems the corner performance of tilt shift lens on it is poor.

http://www.iso72.de/metabones-sony-nex-smart-adapter-mark-iv-vs-mark-iii-sealed-comparsionreview/

Assuming that link provides a reasonable test, what is the matter with Metabones? How hard can it be to do it right?  It seems as though all they need to do is what some have done to their version III adaptors to get it right, and it doesn't seem hard to do. Plus, why would they not test the adaptor with all of the Canon shift lenses, to make sure they work properly? Also, has anyone else seen evidence of the apparent loss of corner sharpness as in the test examples?