User manual SEKONIC STUDIO DELUXE II L-398M

[. . . ] SEKONIC STUDIO DELUXE II L-398M Operating Instructions Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Part Designations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Basic Operation of Meter Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1. Stopper Button Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2. Zero Position Check and Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Standard Accessory Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Incident Light Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1. Lumisphere. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2. [. . . ] For this reason, first use the Lumisphere and measure by standard method from the camera position. Then point the Lumisphere toward the sun and measure. Determine exposure from the mean of the two obtained values. Note: To obtain the mean of the two values, perform as follows. Transfer mean value of the two footcandle indications (aperture scale) to the dial. Example: If 320(8) footcandles and 80(4) footcandles are obtained, the mean value becomes 160(5. 61. In the case of 80(4) and 40(2. 8) footcandles, the intermediate becomes the desired value. Consequently, transfer that value to the dial. Transfer each footcandle value to the dial to obtain exposure. In cases of the same aperture, setting the shutter speed to the average is acceptable. Memo pointer is useful for memorizing the first measured value. 19 4. Many cases of problems occur with reflected light measuring methods due to snow surface glare. Using incident light measurement eliminates these concerns. Freshly fallen snow possesses a reflectivity of approximately 73%, while even after several days in urban areas, this declines only to about 60%. Compensation must therefore be performed. Measurement by standard method is reduced by Example: Note 1 : Note:2: Reduce as much as possible since overexposed snow can take on a flour -like appearance without luster in the finished photograph. compensation amount is based on the reflectivity value of snow. This may vary according to snow quality and soiling. 20 0Note 3: In situations with direct or top lighting (sun near zenith), the Lumisphere will detect reflected light from the snow surface. Some means of blocking the light from below becomes required in this case. b. In some cases, good results can be obtained with reflected light measurement under back light conditions, cloudy snow scenes where glare is less and snow scenes under direct lighting. Install Lumigrid and point light sensor slightly downward to block light from the sky, then from camera position, aim toward subject and measure. Be sure to set the mark at this time and do not employ slides. 5. [. . . ] When light from the subject passes through the lens and becomes focused on the film, the following relationship exists among film plane illumination, subject brightness and image magnification. 31 As can be noted from the above formula, if the subject luminance is fixed and the magnification changes, the film plane brightness (illumination) varies in the inverse proportion (M + 1)2. With a large subject distance, M is small and this effect becomes nearly absent, but as the subject distance decreases, M becomes larger. In an actual photographic example, with a magnification M of 1, film plane brightness becomes (M + 1)2 or 4. [. . . ]