Multi Interface Shoe

MI Shoe or MIS) is a proprietary camera hotshoe introduced by Sony in 2012, replacing an assortment of other proprietary hotshoes used by Sony in various types of cameras in the past.

The Multi Interface Shoe is a proprietary camera hotshoe introduced by Sony on 12 September 2012, replacing an assortment of other proprietary hotshoes used by Sony in various types of cameras in the past, including the Auto-lock Accessory Shoe (aka AAS or "iISO" shoe) introduced by Minolta in 1988 and used on Sony α DSLRs, SLTs and some NEX cameras, and the Smart Accessory Terminals types 1 (SAT) and 2 (SAT2) used on the majority of the Sony α NEX-line.

Otherwise pin 21 is left open in the adapter (indicating wired or remote use).

Assuming that pin 21 is tied to PGND in a camera's hotshoe, this allows flashes compatible with the Multi Interface Shoe to detect if they are mounted on the camera or not as it is necessary for ADI to work.

In 2014, the Hasselblad HV has become the first third-party camera to support the Multi Interface Shoe as well.