that solved the problem? (allow scaled poser camera)
No - I thought that might have caused the problem. It allows you to scale the Poser camera, which puts the field of view out of sync with the Octane Viewport.
but I don't understand why octane is 2.62128??
That's the stand conversion of Poser units (that the Poser geometry is stored in ) to metric metres.
is this the default we must keep?
There shouldn't be any need to change this number.
From the screenshot, it looks like the issue is fixed now?