Nikon 50DX Instruction Manual - Page 31

Effective Speedlight Placement-continued • Emphasizing the outline of the subject When taking a portrait, you can backlight the subject by placing a Speedlight directly behind the subject to emphasize the outline of the subject. • Set the slave flash unit to Manual flash mode (Manual Slave Flash mode with the SB-50DX, p. 52) for rather high output level. • When using a camera in Group I, II or III (p. 28), compensate flash output level (p. 35) to the + side. Subject • Illuminating a subject mainly from the side By using the infrared remote commander (p. 53), a subject can be illuminated mainly from the side with Speedlights placed away from the camera. • Place the Speedlight(s) to achieve desired effect. Subject Slave flash unit SB-50DX with SW-9IR filter Speedlight Placement Single flash (built-in Speedlight) Camera: F80D (Manual exposure mode, Front-Curtain Sync flash mode) Lens: AF Zoom-Nikkor 28-80mm f/3.3-5.6G Master flash unit (built-in Speedlight): Standard TTL Flash Slave flash unit (SB-50DX): Manual Slave Flash mode 60 Camera: F80D (Aperture-Priority Auto exposure mode, Front-Curtain Sync flash mode) Lens: AF Zoom-Nikkor 28-80mm f/3.3-5.6G Master flash unit (SB-50DX with SW-9IR filter): Wireless Flash mode (Automatic Balanced FillFlash with TTL Multi-Sensor) Slave flash unit (SB-50DX): Auto Slave Flash mode Master flash unit without SW-9IR Using more than two Speedlights The brightness of flash illumination is inversely proportional to the square of the distance between the flash unit and the subject. For example, if the distance between Speedlight A 1m (3.3 ft.) Subject 2m (6.6 ft.) and the subject is 1m (3.3 ft.), and Speedlight B is 2m (6.6 ft.), the combined brightness of the two Speedlights will be: A : B = 12 : 22 = 1 : 4 (in meters) Speedlight A or 3.32 : 6.62 = 11 : 44 (in feet)] Therefore, the illumination provided by Speedlight B Speedlight A is four times (or two steps) brighter than that provided by Speedlight B. SB-50DX with SW-9IR filter 61