ProblemLikely causeTry
No autofocus, but DOF preview worksThe lens is set to manual focus mode.For VS28-80 and VS70-200, set the AF/MF switch to AF, and for all other lenses, set the aperture ring to any position other than minimum (f/16, f/22 or f/32 depending on lens).
Neither autofocus nor DOF previewPin 3 of Contax lens does not make contact.Check contact between conurus circuit and Contax lens.
Camera shows an aperture value of 5.6Pin 5 of Contax lens does not make contact.Check contact between conurus circuit and Contax lens.
Camera shows an aperture value of 16Pin 6 or pin 9 of Contax lens does not make contact.Check contact between conurus circuit and Contax lens.
Camera shows an aperture value of 7.1 or 6.7Pin 7 of Contax lens does not make contact.Check contact between conurus circuit and Contax lens.
Camera shows an aperture value of 8.0Pin 8 of Contax lens does not make contact.Check contact between conurus circuit and Contax lens.
Camera shows an aperture value of 1.0Pin 1 of Canon camera does not make contact.Check contact between conurus circuit and Canon camera.
Camera shows an aperture value of 13 after an exposure and aperture diaphragm remains stopped down (darkened viewfinder)Firmware is 3.00 or olderUpdate firmware to 3.01 or newer.
Camera shows an aperture value of 0.0Camera cannot communicate with conurus circuitTry the lens on a different camera.
Camera displays any other aperture value but you cannot set the aperture valueCamera communicates with conurus circuit, but conurus circuit cannot communicate with Contax N-mount lens.Inspect whether all pins of conurus circuit make contact with Contax lens connector.
Aperture blades make a ticking noise repeatedlyCamera communicates with conurus circuit, but conurus circuit cannot communicate with Contax N-mount lens.Inspect whether all pins of conurus circuit make contact with Contax lens connector.

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