Pentax K-50 Operating Manual page 265

Lens and Built-in Flash
Depending on the lens used with this camera, the use of the built-in flash
may not be available or may be limited due to vignetting.
The built-in flash cannot be regulated and fully discharges when A lenses
not set to the s position, lenses manufactured prior to the A lenses or soft
focus lenses are used.
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 F3.5-4.5 ED (IF)
DA 12-24mm F4 ED AL
DA 14mm F2.8 ED (IF)
E
FA 300mm F2.8 ED (IF)
E
DA 560mm F5.6 ED AW
E
FA 600mm F4 ED (IF)
E
FA 250-600mm F5.6 ED (IF)
Available with some restrictions
Lens Name
F FISH-EYE 17-28mm F3.5-4.5
DA 16-45mm F4 ED AL
E
DA 16-50mm F2.8 ED AL (IF)
SDM
DA 17-70mm F4 AL (IF) SDM
DA 18-250mm F3.5-6.3 ED AL (IF)
DA 18-270mm F3.5-6.3 ED SDM
E
FA 28-70mm F2.8 AL
FA SOFT 28mm F2.8/
FA SOFT 85mm F2.8
Restrictions
Vignetting may occur if the focal length is less
than 20 mm.
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.
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.
When the focal length is less than 24 mm or
when the focal length is 35 mm and the shooting
distance is 1 m or less, vignetting may occur.
Vignetting may occur if the focal length is less
than 35 mm.
Vignetting may occur if the focal length is less
than 24mm.
Vignetting may occur if the focal length is 28 mm
and the shooting distance is less than 1 m.
Built-in flash always discharges fully.
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