Am 06.11.2014 um 13:51 schrieb Alan Bowen <bowenalan03@gmail.com>:

Sorry, Wolfgang. I cut too much—

\definefontfamily[mainface][serif][Antykwa-Poltawskiego]

[protrusion=quality,

expansion=quality, 

mode=node,

smallcaps,

force=yes]

\definefallbackfamily[mainface][serif][IFAO Grec Unicode]

[range={02BB-F8FF,10140-1D513},

protrusion=quality,

expansion=quality,

mode=node,

  kern=yes,

force=yes,

check=no,

rscale=0.95]

\setupbodyfont[mainface,10pt]

\definefont[Greek][IFAO-Grec at 10pt]

\starttext

 ἔφεϲιϲ and τελειότηϲ

 

 {\Greek  ἔφεϲιϲ and τελειότηϲ}

\stoptext

still fails. What I get is:

        φει and τελειτη

       ἔφεςις and τελειότης 

Note that the sigmas in the second line are now incorrect too.

You have to put \definefallbackfamily before \definefontfamily.

Wolfgang