We investigate mesons containing charm quarks on fine lattices with a^{-1} sim 5 GeV. The quenched approximation is employed using the Wilson gauge action at beta = 6.6 and nonperturbatively O(a) improved Wilson quarks. We present results for decay constants using various interpolating fields and give preliminary results for form factors of semileptonic decays of D_s mesons to light pseudoscalar mesons.
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