New techniques for strong and weak lensing are applied to very deep 
Hubble and Subaru images, uncovering the most massive lens, and the 
largest lensed images discovered to date. Model-independent mass profiles 
are derived in detail for several clusters, free from the foreground 
'dilution' affecting earlier work, for a meaningful comparison with 
the standard LCDM model - and although the form of these profiles is 
NFW-like in shape, the concentration of mass is surprisingly higher 
than predicted.