Nikon 50DX Instruction Manual - Page 9

3 Adjusting the Zoom-Head Position The SB-50DX has four zoomhead positions: 24mm, 28mm 35mm and 50mm. When the wide-flash adapter is used, the zoom-head position is fixed to 14mm. When a camera body that is compatible with Digital Data Communication is attached to the SB-50DX and a CPU lens is used, the Power Zoom function activates and the zoom head is automatically adjusted. • When the lens focal length is not 24mm, 28mm, 35mm or 50mm, the zoom head adjusts to the closest wideangle setting of the lens in use. (See table below). • When M is not displayed in the LCD panel, the Power Zoom function is activated. If M is displayed, press the ZOOM button a number of times so M disappears from the LCD panel. • To change the automatically adjusted zoom-head position, set the zoom-head position manually. (See next page). • When the wide-flash adapter is attached or when the flash head is tilted up/down, the Power Zoom function becomes inactive. Focal length or zooming position of CPU lens 24mm-27mm 28mm-34mm 35mm-49mm 50mm or longer Automatic adjusted zoom-head position ZOOM 24mm ZOOM 28mm ZOOM 35mm ZOOM 50mm Note: Zoom-head position and guide number The guide number varies according to the zoom-head position (p. 33). Digital Data Communication When the SB-50DX is used with cameras in Groups I and II (p. 28) or Nikon digital SLR cameras, Digital Data Communication is performed. With a CPU lens, the camera automatically sends lens information (focal length, etc.) to the SB-50DX. 16 • Setting the zoom-head position manually • To change the zoom-head position without using the Power Zoom function or when the camera/lens combination is incompatible with the Power Zoom function, press the ZOOM button to set zoom-head position manually. • The zoom-head position changes in four positions-24mm, 28mm, 35mm and 50mm Power Zoom every time you press the ZOOM button. (Fixed at 14mm with the wide-flash adapter.) If the camera/lens combination is compatible with the Power Zoom function, pressing the ZOOM button at the 50mm position activates the Power Zoom function. Pressing the ZOOM button again sets the zoom-head position to 24mm. • When the zoom-head position is set manually, "M" appears above the "ZOOM" indication in the LCD panel. • Generally, set the zoom-head position to the focal length of the lens in use or to the closest wideangle setting of the lens in use (see the table on p. 16). • Wide-flash adapter • With 14mm to 23mm lens, use the built-in wide-flash adapter. • Slide out the wide-flash adapter from the bottom of the flash head, then attach it in front of the flash head. The Power Zoom function becomes inactive, zoom-head position is automatically set at 14mm, and "ZOOM14mm" is indicated in the LCD panel. • To store the wide-flash adapter, detach it from the flash head, then slide it back all the way into its original position. • When using a 14mm lens, the distance between the camera and subject becomes increasingly pronounced from the center of the frame to the periphery, so the peripheral area might not be sufficiently lit in some cases. Zoom-head position in bounce-flash or close-up photography In bounce-flash photography (p. 40) or close-up photography (p. 43), the zoomhead position is fixed at 50mm with the flash head tilted up and at 24mm with the flash head tilted down. However, when the wide-flash adapter is used, the zoom-head position is fixed at 14mm regardless of flash head direction. 17 Basic Operation