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  S1240 S1640
Magnification 12 16
Objective Lens 40mm 40mm
Stabilization freedom ± 5° ± 5°
Eye Relief 17mm 12mm
Diopter Adjustment ± 5m -1 ± 5m -1
Apparent Field of View 4.7° 3.4°
Apparent Field at 1,000m 82m 59.4m
Exit Pupil Diameter 3.3mm 2.5mm
Relative Brightness 11.11 6.25
Interpupillary Distance 59 - 71mm 59 - 71mm
Power supply 4 × AA type alkaline batteries / 1 × 2CR5 Lithium battery 4 × AA type alkaline batteries / 1 × 2CR5 Lithium battery
(Length × Width × Height)
200 mm × 210 mm × 90 mm 200 mm × 200 mm × 90 mm
Weight 1.8 kg (excluding battery) 1.8 kg (excluding battery)