Pentax 39554 *ist Manual - Page 116

114 ADVANCED OPERATION FOR THE BUILT-IN FLASH F, FA and FA J Lenses Compatibility with the Built-in Flash If an FA J, F or FA lens incompatible with the built-in flash is used, pressing the shutter release button halfway down causes rapid blinking of in the viewfinder and on the LCD panel as a warning. If you take a flash picture with an incompatible lens, the corner of the picture may look dark or there may be a dark, semi-circular area on the lower part of the picture. = compatible = Vignetting will occur under the usage conditions = incompatible because of vignetting Lens Name F, Fish-Eye Zoom 17-28mm f/3.5-4.5 FA Zoom 20-35mm f/4 AL FA Zoom 24-90mm f/3.5-4.5 AL (IF) FA* Zoom 28-70mm f/2.8 AL FA Zoom 28-70mm f/4 AL FA Zoom 28-80mm f/3.5-5.6 FA J Zoom 28-80mm f/3.5-5.6 AL FA Zoom 28-90mm f/3.5-5.6 FA Zoom 28-105mm f/3.2-4.5 AL (IF) FA Zoom 28-105mm f/4-5.6 (IF) FA Zoom 28-200mm f/3.8-5.6 (IF) F, FA 35-80mm f/4-5.6 Compatibility Vignetting will occur if focal length is less than 28mm. Vignetting will occur if focal length between 24-28mm. Vignetting may occur in the following cases. • The focal length is between 28- 35mm and the camera-tosubject distance is 3m or less. • The focal length is 35mm and the camera-to-subject distance is 1m or less. Vignetting may occur if focal length is 40mm or less. Vignetting may occur if focal length is 70mm or less.