  We present a quenched lattice calculation of low energy constants using the
chirally improved Dirac operator. Several lattice sizes at different lattice
spacings are studied. We systematically compare various methods for computing
these quantities, using pseudoscalar and axial vector correlators. We find
consistent results for the different approaches, giving rise to f_\pi =
96(2)(4) MeV, f_K = 106(1)(8) MeV, f_K/f_\pi=1.11(1)(2), Sigma= -(286(4)(31)
MeV)^3, the average light quark mass m = 4.1(2.4) MeV and m_s = 101(8) MeV.
