Pentax K-X - Manual (Page 163)

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5
Lens Compatibility with the Built-in
Flash
Depending on the lens used with the a, even if a lens without a hood
is attached, the use of the built-in flash may not be available or may be
limited due to vignetting.
DA, DA L, D FA, FA J, and FA lenses not listed below can be used without
problems.
* The following lenses were evaluated without a hood.
Unavailable due to vignetting
Available depending on other factors
Lens Name
DA FISH-EYE 10-17mm F3.5-4.5ED (IF)
DA12-24mm F4ED AL
DA14mm F2.8ED (IF)
FA300mm F2.8ED (IF)
FA600mm F4ED (IF)
FA250-600mm F5.6ED (IF)
Lens Name Restrictions
F FISH-EYE 17-28mm F3.5-4.5
Vignetting may occur if the focal length is less
than 20 mm.
DA16-45mm F4ED AL
When the focal length is less than 28 mm or
when the focal length is 28 mm and the
shooting distance is 1 m or less, vignetting
may occur.
DA16-50mm F2.8ED AL (IF) SDM
When the focal length is 20 mm or less or when
the focal length is 35 mm and the shooting
distance is less than 1.5 m, vignetting may occur.
DA17-70mm F4AL (IF) SDM
When the focal length is less than 24 mm or
when the focal length is 24 mm and the shooting
distance is 1 m or less, vignetting may occur.
DA18-250mm F3.5-6.3ED AL (IF)
Vignetting may occur if the focal length is less
than 35 mm.
FA28-70mm F2.8AL
Vignetting may occur if the focal length is 28
mm and the shooting distance is less than 1 m.
FA SOFT 28mm F2.8 Built-in flash always discharges fully.
FA SOFT 85mm F2.8 Built-in flash always discharges fully.