I don't find any hint to my problem.

I bought Lucida fonts from Tugboat.

I want to get small caps AND primes (P'(x))

It seem I can't have both

When I use

\usetypescript[lucida]

\setupbodyfont[lucidaot,10pt,rm]

I don't have smallcaps


When I use

\usetypescript[lucida]

\setupbodyfont[lucida,10pt,rm]

primes are ugly


Did I miss something ?