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Message: <blockquote data-quote="PapaST" data-source="post: 354128" data-attributes="member: 8330"><p>Didn't have time to read the entire thread so my take is suspect... but are the lenses that work vs the lenses that don't work, which motor is being used?  For instance, the two that lock up are they using their own AF motor or the camera's?  I'm guessing the 50mm 1.8D uses the D7100 motor while the other lenses uses the lens motor.  Saying how the motor works fine on the D3100 makes me think that the interaction between D7100 and those lenses are messed up possibly not knowing which motor to use or conflicting signals as to which motor to use.</p></blockquote><p></p>