Hi Tim, [PalatinoRoman sa 1] This means "PalatinoRoman scaled at 1 x bodyfontsize. The document's body font size is 12 pt, but chapter headers usually are ... like, about 2.4 * body font size? Hence the size mismatch. [PalatinoRoman sa *] This means "AnotherFont is PalatinoRoman scaled to 1 x the font size at time of calling. Compare these two MWE's (I've changed the font name to texgyrepagellaregular so that the example will work for any ConTeXt user.) \setupbodyfont[12pt] \definefontsynonym[PalatinoRoman][texgyrepagellaregular][features=default] \definefont[AnotherFontSaOne][PalatinoRoman sa 1] \definefont[AnotherFontSaStar][PalatinoRoman sa *] \starttext \chapter{Fonts and \AnotherFontSaOne Fonts} Generalized \AnotherFontSaOne Generals. (Constant size) \chapter{Fonts and \AnotherFontSaStar Fonts} Generalized \AnotherFontSaStar Generals. (Adapt to current size) \stoptext I got this information from page 5 of the Fonts chapter of the long-coming manual. (Not the same as the document detailing what you can do with OTF and Lua, although I think that one, too, is called a fonts manual.) http://context.aanhet.net/svn/contextman/context-reference/en/co-fonts.pdf Cheers, Sietse