sentences:  This lens also had a bulky underslung battery compartment that held four 1.5 Volt AAA alkaline batteries (1.2 Volt rechargeables not compatible) to power the motor.It had 7 elements in 7 groups, was 76.5 mm long, 73 mm in diameter, 87 mm high through the battery compartment, weighed 580 g, had a minimum focusing distance of 1.2 m and was threaded for 58 mm accessories.This lens was also one of the earliest attempts to supersede the heretofore standard 50 mm "normal" lens with today's ubiquitous zoom lens.