Is there a rule-of-thumb for how much to stretch variants of a typeface? For example, if it's 75% as wide, is that condensed or ultra condensed? Or is it all simply relative to my own designs?
Microsoft, it seems, goes with the following:
http://msdn.microsoft.com/en-us/library/windows/Apps/windows.ui.text.fon...
Happened to be rummaging around the OT tags registry tonight and found these very same width values in a document on the 'OS/2' metrics table. Guess they are a sort-of consensus now...
http://partners.adobe.com/public/developer/opentype/index_os2.html
http://www.microsoft.com/typography/otspec/os2.htm
Captured from web.archive.org on 17 Apr 2015. view this capture
So Microsoft=micromanage :)
Don