Weak lensing is a powerful probe of cosmology which can provide an insight into the distribution and evolution of massive structures in the Universe. To date weak lensing studies have taken place predominantly at optical wavelengths, however will soon be readily achievable at Radio wavelengths as we approach a new era of precision with the likes of the SKA. We present our findings from archival VLA and HST observations of the COSMOS field, comparing shape measurements with techniques developed for optical surveys; highlighting prospects and challenges radio observations can bring to weak lensing studies.