The few available data for the reactions $gamma p rightarrow K^{0} Sigma^{+}$ and $gamma n rightarrow K^{+} Sigma^{-}$ are compared to models developed for the processes $gamma p rightarrow K^{+} Sigma^{0}$ and $gamma p rightarrow K^{+} Lambda$. It is found that some of these phenomenological models overpredict the measurements by up to a factor of 100. Fitting the data for all of these reactions leads to drastically reduced Born coupling constants.
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