Sony SEL90M28G Manual page 9

Body contacts
o
Ensure the pins are not bent.
o Ensure nothing is covering or obstructing the pins.
IMPORTANT: If the pins on the camera body are bent, then
required.
6. If there are no bent pins or other obstructions, reattach the lens to the camera body.
7. Turn on the camera.
8. If the issue is still not resolved, try connecting a different lens (if available) to determine
whether the problem is with the lens or the camera body.
9. IMPORTANT: If the issue does not happen with other lenses, then the previous lens
may require service. However, if the issue occurs with other lenses as well, then the
camera body may require Service.
NOTE: If the issue is not resolved and a lens from another manufacturer is being used,
then the lens (or lens adapter) is most likely not compatible. Functionality of third-party
lenses is not guaranteed. Even though a third-party lens may not be able to communicate
with the camera for Auto Focus (AF) and Auto Exposure (AE), pictures may still be able
to be taken by setting the camera to Manual (M), then manually setting the shutter speed,
aperture, ISO, and focus.
Service will be