A mounting adapter includes: a first body section having a connection section attached to one side of an accessory device and a first holding arm that holds one side face of a portable type electronic device, a second body section having a second holding arm that is provided to project/retract from inside to outside and holds a side face of the portable type electronic device, a second holding arm urging member that urges the second holding arm in a direction opposite to the direction in which the second holding arm extends, and a hinge member that connects the first body section and the second body section, and the mounting adapter sandwiches the portable type electronic device between the first holding arm and the second holding arm in an open state when in use.

A mounting adapter includes: a first body section having a connection section attached to one side of an accessory device and a first holding arm that holds one side face of a portable type electronic device, a second body section having a second holding arm that is provided to project/retract from inside to outside and holds a side face of the portable type electronic device, a second holding arm urging member that urges the second holding arm in a direction opposite to the direction in which the second holding arm extends, and a hinge member that connects the first body section and the second body section, and the mounting adapter sandwiches the portable type electronic device between the first holding arm and the second holding arm in an open state when in use.

An electronic viewfinder unit includes a finder unit and a base member. The finder unit includes a display unit, an eyepiece portion, and a lens holding member holding a lens that guides a light flux emitted from the display unit to the eyepiece portion. The base member includes a guide member configured to guide the electronic viewfinder unit to a housed state and a protruding state. The base member includes a holding portion and a turning member. The holding portion is provided with a first holding member and a second holding member that face each other with an optical axis of the lens in between. The turning member has one end held by the first holding member and another end held by the second holding member, and is turnable about an axis orthogonal to the optical axis of the lens.

An image-capturing apparatus includes a main body and a finder unit configured to transition between a retracted state and a projected state. The finder unit includes a non-rotatable portion provided with a rotation shaft, a rotatable portion that is rotatable around the rotation shaft and has an eyepiece, and a restricting member that restricts a transition from a pulled-out state to the retracted state, the eyepiece has an engaging portion and the restricting member has an engaged portion having a convex shape, the engaging portion and the engaged portion being engaged with each other in a transition between the projected state and the retracted state, and an engagement between the engaging portion and the engaged portion is released when the rotatable portion is rotated in the pulled-out state.

Digital cameras comprising a lens assembly comprising N lens elements L.sub.1-L.sub.N starting with Li on an object side, wherein N is >4, an image sensor having a sensor diagonal S.sub.D, and a pop-out mechanism that controls a largest air-gap d between two consecutive lens elements within lens elements L.sub.1 and L.sub.N to bring the camera to an operative pop-out state and a collapsed state, wherein the lens assembly has a total track length TTL in the operative pop-out state and a collapsed total track length cTTL in the collapsed state, wherein S.sub.D is in the range of 7-20 mm and wherein cTTL/S.sub.D<0.6.

Digital cameras comprising a lens assembly comprising N lens elements L.sub.1-L.sub.N starting with Li on an object side, wherein N is >4, an image sensor having a sensor diagonal S.sub.D, and a pop-out mechanism that controls a largest air-gap d between two consecutive lens elements within lens elements L.sub.1 and L.sub.N to bring the camera to an operative pop-out state and a collapsed state, wherein the lens assembly has a total track length TTL in the operative pop-out state and a collapsed total track length cTTL in the collapsed state, wherein S.sub.D is in the range of 7-20 mm and wherein cTTL/S.sub.D<0.6.

A head mountable camera system includes a head covering and a camera system removably attached to the head covering in an inner space. The camera system includes a band, a camera within an interior cavity of the band including a lens exposed through a first surface of the band and exposed through at least one opening in the first surface of the head covering, a controller within the interior cavity for controlling the at least one camera, a power source within the interior cavity configured to power the controller and the at least one camera, and electrical connections connecting the controller, the power source, and the at least one camera together.

A head mountable camera system includes a head covering and a camera system removably attached to the head covering in an inner space. The camera system includes a band, a camera within an interior cavity of the band including a lens exposed through a first surface of the band and exposed through at least one opening in the first surface of the head covering, a controller within the interior cavity for controlling the at least one camera, a power source within the interior cavity configured to power the controller and the at least one camera, and electrical connections connecting the controller, the power source, and the at least one camera together.

An accessory configured to be detachably mountable to an image pickup apparatus including a first mount portion including first bayonet claw portions, and first terminals, the accessory including a second mount portion including second bayonet claw portions configured to enable engagement with the first bayonet claw portions, and second terminals configured to enable contact with the first terminals, in which the second terminals are provided at positions that are different from positions of the second bayonet claw portions, and wherein, a half line that extends from a central axis of the second mount portion and passes through a second terminal that determines whether an optical apparatus is mounted on the image pickup apparatus or not, passes through a predetermined second bayonet claw portion.

An accessory configured to be detachably mountable to an image pickup apparatus including a first mount portion including first bayonet claw portions, and first terminals, the accessory including a second mount portion including second bayonet claw portions configured to enable engagement with the first bayonet claw portions, and second terminals configured to enable contact with the first terminals, in which the second terminals are provided at positions that are different from positions of the second bayonet claw portions, and wherein, a half line that extends from a central axis of the second mount portion and passes through a second terminal that determines whether an optical apparatus is mounted on the image pickup apparatus or not, passes through a predetermined second bayonet claw portion.