Need some help .. I'll been hanging on to my 5D2 coz its the one I can still use with my array of classic Zeiss and Leica R lenses. They wouldn't work with my other Canon body e.g. 7D and 1Dx. Thinking of upgrading my 5D2 but would like to know how to get my 1Dx to work with those lenses ... I've tried upgrading the firmware and gotten adaptor without the chip but still doesn't work. Any idea how to resolve this?? Much obliged ..