What's the effective distance at telephoto setting for 8mm camera with 9-27mm lens?

[MikeHi]

Assume the 8mm camera specs listed below. The lens is f1.8 / 9-27mm.

My understanding is that the normal focal length for 8mm film is 12.5 mm. Assume the camera is 70 feet away from the filmed object.
The camera is set to telephoto. Does it mean that the effective distance is decreased by the factor of 27/12.5 = 2.16,
i.e. the effective distance is 70/2.16 = 32.4 feet?




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Camera Specifications
Camera Maker: Bell & Howell.
Model: 414PD Director Series
Film Type: Double 8mm - 25ft or 50ft film roll
Film Speeds: ASA 10 to ASA 40
Running Speed: Single frame, 16fps and 48fps (slow motion.)
Lens: Bell & Howell Varamat f1.8 / 9-27mm - Power Zoom
Mechanism: Spring Motor
Lightmeter: Built-in Dual Electric-Eye.
Non-reflex viewfinder (parallax corrected and coupled with zoom.)
The camera zooms from telephoto to wide angle. It focuses from 6.0 feet to infinity. The camera has built in haze filters.
The camera can adjust from f/1.8 to f/22 to accommodate all types of film