4 pin Nikon hot-shoe proprietary connector
This is proprietary (non-standard, product specific ) connector. A proprietary connector is the special connector that can only be used with a certain device(s).
- Nikon TTL Hot-shoe interface pinout for Nikon D70, D3100, D3S, D1, D2X, D3X, D60, D2Xs, D3, D1H, D700, D40, D4, D1X, D300, D200, D40x, D300S, D3000, D50