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Ok found the instruction and a tutorial. WOW now it is clear!! Sorry for the stupid question, I came from a symmetrical view camera.

Thanks, but so It is not really clear at all for me the principle behind the asymmetrical tilt and swing. (I supposed best is to rotate the lens on the axes) I am looking for some documentation.

Thanks you all! So I discover my lens is a convertible one.

What could be the difference of unscrewing the front instead of the rear element from the optical point of view? (it there is one?). ...

I am a newcomer in LF... I have a Sinar X. I have a question.
Do you know if the swing gear, really rotate the lens lens plane on the lens axes? I have seen that the rotation gear is off-center......

Dear all,
I am an Italian, newcomers in LF.
My first question is very simple. I have noticed that the Sironar 150mm could be unmounted from Copal0, and, using only the front part is like having a...