MasterBuilt puts every single lens through its paces. During the prototype stage we test lens both photographically and technically. We often test lenses with some of the most notable cinematographers and photographers. After the prototypes are finished and put into production – we then conduct official tests and distribute them on our Instagram page @LENSTESTS. Please see a few of the tests here under each MasterBuilt series – then check @LENSTESTS for more updated samples.