Pentax ist User Manual Page 116

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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 Compatibility
F, Fish-Eye Zoom 17-28mm f/3.5-4.5
FA Zoom 20-35mm f/4 AL Vignetting will occur if focal length
is less than 28mm.
FA Zoom 24-90mm f/3.5-4.5 AL (IF) Vignetting will occur if focal length
between 24-28mm.
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) Vignetting may occur if focal length
is 40mm or less.
FA Zoom 28-200mm f/3.8-5.6 (IF) Vignetting may occur if focal length
is 70mm or less.
F, FA 35-80mm f/4-5.6
Vignetting may occur in the
following cases.
The focal length is between 28-
35mm and the camera-to-
subject distance is 3m or less.
The focal length is 35mm and
the camera-to-subject distance
is 1m or less.
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