Zoom And Scale Demystified

As part of Project Educate's Fractal Week, =Colliemom produced this excellent news article packed with Apophysis tips. One tip that seems to have caused some consternation is that of the negative zoom factor. Nothing wrong with it - it works as a reducer of render time. But I hope here to show how it works and provide a definitive guide to those two magnification parameters that often raise questions from new and experienced users alike.

Developers and gurus: let me know if my attempts at explanation contain any howlers!

*coughs* Shameless plug for own news article: [link]