Using a maximum entropy technique within a finite band Eliashberg formalism, we extract from recent high accuracy nodal direction angular-resolved photoemission spectroscopy data in optimally doped Bi2Sr2CaCu2O8+delta (Bi2212) a quasiparticle electron-boson spectral density. Both normal and superconducting states with d-wave gap symmetry are treated. Finite and infinite band results are considered and contrasted. We compare with results obtained for the related transport spectral density, which follows from a similar inversion of optical data. We discuss the implication of our results for quasiparticle renormalizations in the antinodal direction.
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