Focusing platform

The utility model discloses a focusing platform, including fixing saddle, bracing piece, increasing apart from the mirror holder and increase apart from the mirror, the bracing piece set up in on the fixed saddle, increase apart from the mirror holder set up in on the bracing piece, wherein, increase and be provided with fixed increasing apart from the frame of mirror apart from the end of extending of mirror holder, the medial surface of frame is provided with the boss, be provided with the clamping ring on the boss, increase and clamp apart from the mirror in the annular groove that boss and clamping ring formed, the edge of terminal surface is provided with the arc chamfer under the frame. The utility model provides an increasing of focusing platform can be taken out the back with the clamping ring apart from the mirror holder and changed and to increase apart from the mirror lens to satisfy the focusing requirement of different cameras, improve the practicality, the edge of terminal surface is provided with the arc chamfer under the frame, is difficult for running into increasing to result in increasing apart from the mirror apart from the mirror holder shifting, is convenient for change and has improved work efficiency.