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Metal Working

Slide-calculator-for-photographic-lighting

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Slide calculator for photographic lighting

Details

Inventors: Reed, Muriel A.; Reed, Roger G.;
Assignee:
Primary Examiner: Fuller; B. R.
Assistant Examiner:
Attorney, Agent or Firm:

The object of the invention is to provide a slide calculator to make the determination of flash-to-subject working distances (WD) easy and accurate for amateur and professional photographers. Light sources other than flash can be used. The calculator uses known factors such as lens f-stop, film speed, light ratio, flash guide number (GN), flash power setting and filter exposure factors to determine working distances even when using multiple flashes simultaneously. The indicia on the slides and the indicia adjacent the appropriate windows on the panels are arranged in a predetermined manner and relationship to each other to permit the desired working distance to be determined accurately. Working distances for several flashes (each flash having a different purpose) can be determined and their affect on each other is compensated for in the calculations. Then the several flashes can be used in combination to achieve a desired lighting effect with correct exposure.

DETAILED DESCRIPTION There is provided by this invention a four-piece slide calculator for determining accurate Working Distances for studio lighting situations, for subjects lit by direct sun light and for situations requiring a definite light-ratio from the front of the subject to the back of the subject illuminated by a single flash.
The slide calculator includes an envelope-like structure having a front and back panel which are secured to one another.
Each panel has at least one window-like aperture and includes indicia associated with each of said apertures.
Three slide members are also provided which are positioned between the front and back panels and are movable therebetween.
The slide members also include indicia thereon arranged to appear at preselected apertures and to cooperate with indicia on the front or back panels in order to permit the desired calculation.
For example, in determining the Working Distance for the Main-Light, the front panel includes two apertures with indicia relating to Lens f-stop associated with one aperture, and indicia relating to an Angle .
theta.
associated with the other aperture where .
theta.
is the angle between a line drawn from the Camera to the Subject and a line drawn from the Main-Light to the Subject.
Beginning at the top, the first movable slide includes indicia relating to Film speed arranged to cooperate and permit alignment with the Lens f-stop indicia on the front panel.
The opposite edge of said movable slide member includes indicia relating to Exposure Factors related to the Lens.
The second movable slide includes indicia relating to Light-Ratios arranged to cooperate and permit alignment with the Exposure Factor indicia associated with the first movable member.
The opposite edge of the second movable member includes indicia relating to Exposure Factors related to the Main-Light.
The third movable slide member includes indicia relating to Working Distsnce arranged to cooperate and permit alignment with the Exposure Factor indicia relating to flashes associated with the second movable member

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