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As for focal lengths of the Ltds, 43mm is the normal focal length (FL) for 35mm film, like has been pointed out. 31mm is then about 1 FL-stop wider than 43mm, meaning the FoV is about 50% larger. 77mm is the odd one, as 1 FL-stop would be 61mm and 2 FL-stops would be 86mm; 77mm is about 1-2/3 stops longer than 43mm.
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