Always good to redo tests, so it's 12.75mm for now. I'll do a complete rerun in due time. As said my lower values were inaccurate (as I was more interested in long lenses for portraits by then).

The Poser camera seems to behave as a 50mm camera, so the focal multiplier is 50/35 when comparing it to a real 35 mm one. 

There also is a difference between dolly cams and revolving ones. This becomes apparent when exporting Poser cam settings to Octane. Perhaps I did my measurements with Main Camera (which is a revolving one). 

Thanks, by all means. 

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though