Hello Andrei and Ayrton,
I forgot to mention that the shift forwards depends on the number of shots
around, when shooting 6 around then a NPP offset of 4 mm is sufficient, when
shooting 3 around then 7mm is better.
The shift itself is not important, the only thing what really counts is the
position of the front of the lens, it is best to position the front of the
lens (where light rays enters the lens at a -90 degree angle) in line with
the outside of the ring adapter.
I shoot often in a 60 degree slanted position to get a large FOV and at the
same time a large overlap at the horizon, especially with the shaved Tokina
10-17mm zoomlens I can get a sufficient resolution @13.5-14mm with just 6
See the snapshots of the setup, I think they are self explaining:
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