1¼-inch television tube Lenses
16 x 12 mm image area · 1 interactive lens diagram
Historical studio and outside-broadcast television cameras | Nominal 16 × 12 mm target; 20 mm diagonal
Schneider listed the TV-Variogon 20–600mm among lenses for 1¼-inch pickup tubes. The catalog uses the 16 × 12 mm, 20 mm diagonal image reference documented for 30 mm Plumbicon tubes. The inch designation refers to the tube class, not the active image diagonal. Actual target scanning and camera prisms vary.