Caecilia, Caecilia Condensed, Helvetica Neue are built in (plus a monospace font that requires specific markup to invoke). These are not identical to what you would get if you purchased them, as Amazon has modified the smaller sizes so they are more like demi-bold than regular and are more readable and crisp than they would otherwise be. These also have very good Unicode support.
KF8 format may use embedded fonts, and when they do, you can still choose a built-in typeface if you prefer. I find that the DPI of the Kindle screen is not usually sufficient to display embedded fonts crisply at smaller text sizes (1-3). Embedded fonts are unlikely to be 'optimized for eInk'. But they probably look okay on Fire or the Kindle apps that support KF8.
You can hack to add your own font but these will suffer the same issues at small text sizes as embedded fonts, so you'd want to get one that is 'modified for eInk' as Blossom suggests. I don't know if it is possible to point a stylesheet at fonts you have placed on the Kindle, as you can with other ereaders.
The Kindle Previewer font selection for KT does not reflect what is actually available on KT. The KF8 sample .mobi file, which displays examples of each typeface on Kindle Fire and the Kindle apps with KF8 support does not do so on KT: they just render with whatever typeface is selected in the Fonts menu. Maybe they are planning some software update to add these, or maybe they will only be on the 'new' Kindle Touch that is coming out (one rumor is that it will have a 1024x768 210DPI display, or so I'm hoping).
Last edited by tomsem; 08-30-2012 at 05:56 PM.
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