Imaging apparatus, lens apparatus, and intermediate accessory

An accessory detachably mountable to an imaging apparatus, the accessory comprising:

• a mount unit;
• and
• a contact holding member provided on the mount unit where a plurality of electric contacts of the accessory are arrayed,
• wherein the plurality of electric contacts includes:
• a first power contact configured to receive first power,
• a second power contact configured to receive second power,
• a third electric contact group configured to be used to perform first communication, and
• a fourth electric contact group configured to be used to perform communication that is different from the first communication,
• wherein the contact holding member has two tiers each of which holds electric contacts included in the plurality of electric contacts,
• wherein the third electric contact group is held on one of the two tiers and the first power contact and the second power contact are held on the other of the two tiers, and
• wherein, where a direction of rotation of the accessory when mounting the accessory is a first direction, the third electric contact group, the first power contact and the second power contact are arrayed in the order of the third electric contact group, the second power contact and the first power contact in the first direction.

A camera system, comprising:

• an imaging apparatus;
• and
• an accessory configured to be detachably mountable to the imaging apparatus,
• wherein the imaging apparatus includes a first mount unit and a contact holding member provided to the mount unit where a plurality of electric contacts are arrayed, the plurality of electric contacts of the imaging apparatus including:
• a first power contact used to supply first power,
• a second power contact used to supply second power,
• a first electric contact group used to perform first communication with at least one of accessory mounted to the imaging apparatus, and
• a second electric contact group used to perform communication that is different from the first communication with at least one of accessory mounted to the imaging apparatus,
• wherein the contact holding member has two tiers each of which holds electric contacts included in the plurality of electric contacts of the imaging apparatus,
• wherein the first electric contact group and the second electric contact group are held on one of the two tiers and the first power contact and the second power contact are held on the other of the two tiers,
• wherein the accessory includes a second mount unit capable of coupling with the first mount unit, and where a plurality of electric contacts are arrayed, the plurality of electric contacts of the accessory including:
• a third electric contact group made up of electric contacts that comes into contact with electric contacts included in the first electric contact group in a state where the accessory is mounted to the imaging apparatus directly, and
• a fourth electric contact group made up of electric contacts that comes into contact with electric contacts included in the second electric contact group in a state where the accessory is mounted to the imaging apparatus directly, and
• wherein, where a direction of rotation of the accessory with respect to the imaging apparatus when mounting the accessory directly to the imaging apparatus is a first direction, the second electric contact group and the first electric contact group are arrayed in the order of the second electric contact group and the first electric contact group in the first direction.