Dear gang, 

It seems that ConTeXt does not currently implement optical scaling for Latin Modern -- at least not by default. For example:

=======
\startTEXpage[offset=1em]
Test {\tfa Test} {\tfb Test} {\tfc Test} {\tfd Test} {\tfx Test} {\tfxx Test}
\stopTEXpage
=======

In the log we have

=======
mkiv lua stats  > loaded fonts: 2 files: latinmodern-math.otf, lmroman10-regular.otf
=======

Is this behavior intentional? The needed sizes are certainly available (/texmf/fonts/data/gust/lm).

This issue came up while trying to test/implement something else. Although Computer Modern / Latin Modern is perhaps hardly popular for contemporary publication work, a full implementation of the full palette of optical sizes is still useful as a benchmark, etc.

Best wishes
Idris

--
Professor Idris Samawi Hamid
Department of Philosophy
Colorado State University
Fort Collins, CO 80523