dourbalistar
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Yes, the Amotal is rangefinder coupled. It was made by TTH for the American "Foton" camera, in 1948. Some of those lenses have recently been remounted for Leica and mirrorless cameras. The optical design is based on the Speed Panchro, also made by TTH, a famous cine lens. Yes, it is a 2" f/2 lens. Certainly very British indeed.
Erik.
Erik, being a cine lens, does the "T" engraving stand for T-stop? I see markings for f/2.2 and f/22, but I don't see a marking for f/2.