Working with scale in layouts.

When using the “zoom” command followed by (scale) 1:150 is achieved with a zoom scale of 66/10XP. How does this command work then? Why not enter 1/150XP?

First let us assume that you are using the command “mview” to creating windows in your presentation layout (or in paperspace depending on your version of AutoCAD). So, what units are you using?

Lets say you are metric and drawing in meters.
MODELSPACE: 1 unit = 1 m = 1000mm

And let us say that presentation is in millimetres (this is typically so for such layouts):
PRESENTATION/PAPERSPACE: 1unit = 1mm
So the drawing as seen through the window in the layout has to be scaled relative to that layout – hence we use the XP parameter.

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