I have just bought a canon 6 dmk2 and whenever I press the shutter button it comes up with err 70 I’ve tried 3 different memory cards 3 different lenses and resetting camera to factory settings anyone got any idears
Removing lens and battery and re install are the recommended steps. That said I have also read that it seems to be linked with a bad main board, and some have even seen it return down the road after servicing, (seems it may have been common on the 70d). I would consider returning for refund and finding another 6d if the battery and lens refit did not solve the problem