Yaw occurs when you use tilt and swing simultaneously and the camera you are using has the tilt above the swing. The only field camera that I know that is jaw free is the Gandolfi Variant, the two view cameras I know that are yaw free are the Sinar P models and the Arca Swiss. All of these cameras have the tilt below the swing to prevent Yaw.
Cameras that have base tilts require a bit more iterations to focus than those which have axis tilts, I have never used the asymetrical tilts like those on the Ebony cameras so I am unable to tell you if they work, but the people who have them seem to like it a lot and it seems to make it easier to focus with tilts.
The metod I use to focus is simple and most of the time it does not require any refocusing. I focus on the near subject and mark the position on the bed (or rail), I then focus on the far subject and mark the position on the bed. After these two I place the standard in between these two points and then I tilt until I see at least 1/3 (or more, depending on the distance between the two points) of the foreground come into focus, I then close the diaphragm and check with a loupe to see if all I want in focus is in fact in focus. If it is not I then might close the aperture more or refocus.
Now, to be honest, 99% of the time I just focus, close to f/45 and take the shot..... seems to work for me..
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