We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
FIG. 1 — Author demonstrates his zoom lens motor drive mounted on Pan Cinor varifocal lens on Bolex camera. Enclosed micro-switches are at 1 and 2, the unit’s motor at 3, and the zoom lever at 4.
FIG. 2 — Looking at unit from opposite side we see zoom lens lever coupled to control arm at 4. Battery for driving zoom motor is at 5, and 3-position switch at 6.
MOTOR FOR A ZOOM LENS
Remote control electric drive enables cameraman to pan or tilt and operate zoom lens simultaneously with ease.
By ROY ZEPER
lyjANUFACTURERS of zoom lenses have so concenJ 1 trated on improving the optics of such lenses that one of the photographer’s greatest needs — a motor-driven zoom lens — has received little or no attention. As far as I know, no such device appli¬ cable to zoom lenses now on the market is presently available.
For the lone cinematographer working with a zoom, panning and tilting the camera simultaneously while operating the zoom control lever is exceed¬ ingly difficult. Putting the zoom control in the han¬ dle of the pan head, enabling panning and zooming to be controlled by one hand, seemed a most logical solution . . . and a goal I set out recently to
accomplish.
Earlier, I had designed a motor drive for my Pan Cinor zoom lens which enabled me to operate my zoom-equipped Bolex H-16 mounted on the front of my car for a sequence of special low-angle mov¬ ing camera shots. Zooming was controlled remotely from the car’s dashboard. The complete set-up was illustrated and described in an article in the May,
1961, issue of American Cinematographer.
The first consideration in constructing such a gadget was the method by which it would be en¬ closed and mounted on the zoom lens without having to alter the Pan Cinor and its zooming lever in any way. I have utilized an opaque plastic sheet, cut to required shape and the narrowest section formed to encircle the zoom lens itself. A strip of moleskin applied to the inside of the encircling plastic pro¬ tects the lens housing from abrasion.
On the right-hand side, a 24-volt 1-rpm reversible motor was mounted and positioned so the motor shaft extended through the panel of the enclosure at a point corresponding to the pivotal point of the zoom lens operating lever (Fig. 1). An arm mounted at one end of this motor shaft has its free end angled at 45 degrees and is secured to the end of the zoom lever by means of a machine screw, as shown at (4) in Figs. 1 and 2.
Two micro-switches, shown at (1) and (2) in Fig. 3, are located at points corresponding with the 17mm and 85mm focal length positions of the zoom
168
AMERICAN CINEMATOGRAPHER, MARCH, 1963