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A twin-lens reflex camera (TLR) is a type of camera with two objective lenses of the same focal length. One of the lenses is the photographic objective or "taking lens" (the lens that takes the picture), while the other is used for the viewfinder system, [ 1 ] which is usually viewed from above at waist level.
The system is based on 38 mm wide mounting plates with a 45° dovetail rail on the sides, [1] which is clamped into place on the tripod head receiver with a screw-fastened grabber plate. Starting in the 1990s, with the popularization of the Arca-Swiss B-1 ballhead, many other companies began producing plates and including Arca-Swiss style ...
The T-mount is a standard lens mount for cameras and other optical assemblies. The usual T-mount is a screw mount using a male 42×0.75 (42 mm diameter, 0.75 mm thread pitch) metric thread on the lens with a flange focal distance of 55 mm and a mating female 42mm thread on a camera adapter or other optical component.
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Some ball heads also have a separate panoramic rotation joint on the base of the head. The head has two main parts, the ball, which attaches to the camera, and the socket, which attaches to the tripod. The camera is attached to the ball by means of quick release plate or a simple UNC 1/4"-20 [7] screw. The socket encloses the rotating ball and ...