What kind of lens elements are used in twin lens relflex cam
As you may or may not know, "lens element" refers to the individual optics that make up a lens, so your question is a bit vague for me. However, I will attempt an answer under the assumption you mean to inquire about the lenses themselves.
Mamiya, Yashica, Seagull and Rollei are the most widely known 120 format versions of these cameras. Although Mamiya may not have been the only one, they permitted switching focal lengths by employing a blind in the camera body. The top lens provided the view while the lower lens took the picture with it's leaf shutter. Parallax could therefore become an issue if the camera got close to the subject.
There were also a few "mini" TLR's that used the 127 format, and Kodak made a fixed focal length version in the 1950's .
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