I bought an ELX - seems to work fine until you switch lenses. With the 150 CF it operates perfectly. When I mount the 50 cf or the 80 cf the lenses do not fire / the shutter is not tripped an the aperture never closes - like the trip from the camera body is not engaging the lenses. Then when you put the 150 back on all is as it should be, any help or ideas? All 3 lenses function perfectly on my other hasselblad bodies.