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Corrections to the Born approximation in photo-induced strangeness productionoff a proton are calculated in a semi-realistic microscopic model. The vertexcorrections and internal contributions to the amplitude of the $\gamma p \toK^+ \Lambda$ reaction are included on the one-loop level. Differentgauge-invariant phenomenological prescriptions for the modification of the Borncontribution via the introduction of form factors and contact terms arediscussed. In particular, it is shown that the popular minimal-substitutionmethod of Ohta corresponds to a special limit of the more realistic approach.Comment: 10 pages, 6 figures in the tex

Comparing phenomenological recipes with a microscopic model for the electric amplitude in strangeness photoproduction