Pentax K-X Operating Manual page 51

Depending onthe lens used w ith the
J'_-X, 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
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)
Available depending on other factors
Lens Restrictions
F FISH-EYE 17-28mm F3.5-4.5 Vignetting may occur if the focal length is less
than 20 mm.
When the focal length is less than 28 mm or
DA16-45mm F4ED AL when the focal length is 28 mm and the
shooting distance is 1 m or less, vignetting
may occur.
When the focal length is 20 mm or less or when
DA* 16-50mm F2.8ED AL (IF) SDM the focal length is 35 mm and the shooting
distance is less than 1.5 m, vignetting may occur.
When the focal length is less than 24 mm or
DA17-7Omm F4AL (IF) SDM when the focal length is 24 mm and the shooting
distance is 1 m or less, vignetting may occur.
Vignetting may occur if the focal length is less
DA18-250mm F3.5-6.3ED AL (IF) 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.
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