Is Zoom Factor Based On Focal Length Or AOV Ratios?

Inspired by Rein Raud's question in chat.

I remember having this same question a while back and deciding it was focal length.

One reason would be that, technically the stated AOV is dependent on the imager size, where as focal length makes no such assumptions.

So with this standard Fuji vari focal lens, with a stated zoom of 2.7x, we get 2.72x by...

*** ***** ******, **** ******** ***** ****** **** ** *** we ****.*******.***, *** *** */*" *** */*" ****** ****** ***** *******, respectively.

* **** *** **** ** ********** ******** ** *** *****, and ** ******* *** *******-******** ** ***********!

Login to read this IPVM discussion.
Why do I need to log in?
IPVM conducts unique testing and research funded by member's payments enabling us to offer the most independent, accurate and in-depth information.

* ***'* ***** *** ** * ******** ****** ****** - different ****** ***** *****, ** **** **** **** **** *** backfocus ********. **** (****?) */**-***** ******* **** ********** *********, ** even **** ***** ********* **** *** ****** ** ******* ***** affect "**** ******". ********* ************* ********** **** *** ************ ** the **** *** **** **** *** *** ** *** */*" camera ***'* *** **** ** ** ******* ****'* */*"******.

** ** ******* ** ****, ******** ******** *** ********* *********** could ****** *** ************ - *** *** ***** ******* ** use *** *** **** * "*******" **** ****, *** **** a ***** **** **** *** ** ***** **. ***.

**** ****** ** ***** *** ************* **** * ****** ** the **** ****** - **** ******* ** ************ *** ***** cameras ** **** ** ****. *** **** ******, **** **** specifically **** ***** **** ***** ** ********* ** *** ***** range ** ****.