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Hi,

I agree with FvM.

So let´s say the output side is high impedance, then

* if the input side is low impedance: then f_res = 1/ (2*Pi* sqrt(L1 * C2))

* if the input side is high impedance, then f_res = 1/ (2*Pi* sqrt(L1 * Cs))  .. with Cs = 1 / ( 1/C1 + 1/C2)) = series impedance of C1 and C2

in both cases talking about cutoff frequency is not correct .. because it´s un undamped resonance.

Klaus