... . Folding arm and head for easy storage 1) Item/model: HT/A201, HT/A 301, HT/A 401, HT/A 401+ 2) Aperture: 285mmx285mm 3 ... 4) Objective lens: a) HT/A201: 1-element f=290b) HT/A301, HT/A401: 3-element f=310 c) HT/A401+:1-element f=290 5 ... ) Lamp/life: a) HT/A201, HT/A301: EHJ 24V 250W/50hb) HT/A401, HT/A401+: EVD ...