We present a new algorithm for inverting poorly resolved gravitational lens systems using the maximum entropy method (MEM). We test the method with simulations and then apply it to an 8 GHz VLA map of the radio ring lens MG1654+134. We model the lens as a singular isothermal sphere embedded in an external shear field and find the critical radius of the lens is b=0\9820, the dimensionless shear is \γ=0.0771, and the position angle of the shear is \θ=100\8. These results are consistent with the results obtained by Kochanek (1995) using a complementary inversion algorithm based on Clean.
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Wallington et al. (1996) studied this question.