Tau tau fusion to light h and heavy H,A Higgs bosons is investigated in the
Minimal Supersymmetric Standard Model (MSSM) at a photon collider as a
promising channel for measuring large values of tan(beta). For standard design
parameters of a photon collider an error close to unity, uniform for tan(beta)
above 10, may be expected, improving on complementary measurements at LHC and
e+e- linear colliders.