The Talbot effect which also appears for the foci of microlens arrays
can, in principle, be used for array illuminators. In particular, the
multiplication of the foci in the fractional Talbot planes seems to be
promising. Certainly, in practice there are three effects which limit
the application of the fractional Talbot effect for microlens arrays.
Theoretical, numerical and experimental results are given to demonstr
ate these limitations.