Abstract: The present application provides a lens breech locking device, which relates to a structure for locking a lens. It comprises a lens (1) and an adapter (2), a lens placement slot (3) for placing the lens (1) is arranged on the adapter (2), wherein, a plurality of vertical fork flanges (5) with claws (4) are mounted in the lens placement slot (3) for adjusting the position of the lens (1) on the adapter (2), the claw (4) is located between a chassis (13) of the vertical fork flange (5) and the bottom of the lens placement slot (3). The present application adds four vertical fork flanges to the lens placement slot of the adapter/camera, and limits the lens through the vertical fork flange, so that the lens can be better locked on the adapter.

Abstract: A lens adapter and its back-locking lens fixing device are provided here. The lens fixing device comprises a connecting base (3) which has a receiving hole (31) for receiving the connecting end of the tube body (1) axially opened on it; the lens fixing device further comprises a limiting portion (4) mounted on the connecting base (3), which comprises a rotational portion (41) rotatably sleeved outside of the connecting base (3) and three second male pawl portions (42) those are connected with the rotational portion (41) and extend into the receiving hole (31) through a sidewall of the connecting base (3). The design lens adapter and its back-locking lens fixing device are clever and practical.

Abstract: A lens adapter is provided, comprising a cylindrical base, one end of the base is provided with a first mounting seat for connecting with a lens and a manual aperture controlling ring sheathed on the base, the other end of the base is provided with a second mounting seat for connecting with a camera. The lens adapter also comprises an adjusting mechanism connected to a lens aperture controlling rod and the manual aperture controlling ring. The manual aperture controlling ring is adjusted by the adjusting mechanism to make the rotation angle of the manual aperture controlling ring linearly proportional to the size variation of the lens aperture. The lens adapter allows the rotation angle of the manual aperture controlling ring linearly proportional to the size variation of the lens aperture in a manner of synchronously changing, thus facilitating the user to control the lens aperture.