Pentax K-70 Operating Manual page 124

About Mount Names
DA and D FA lenses with a motor and FA zoom lenses with
a power zoom use the KAF2 mount. (Of these lenses, the
lenses without an AF coupler use the KAF3 mount.)
The KAF3 mount equipped with an electromagnetic
diaphragm mechanism instead of an aperture control lever is
referred to as the KAF4 mount.
FA single focal length lenses (non-zoom lenses), DA and DA
L lenses without a motor, and D FA, FA J, and F lenses use
the KAF mount. (The power zoom function is not compatible
with this camera.)
Refer to respective lens manuals for details.
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122
Compatibility with the Built-in Flash
Depending on the lens being used, the use of the built-in flash
may be limited.
Lens
DA FISH-EYE 10-17mm
F3.5-4.5 ED [IF]/
DA 12-24mm F4 ED AL/
DA 14mm F2.8 ED [IF]/
DA 15mm F4 ED AL/
D FA 15-30mm F2.8 ED SDM WR/
k
FA 300mm F2.8 ED [IF]/
k
DA 560mm F5.6 ED AW/
k
FA 600mm F4 ED [IF]/
k
FA 250-600mm F5.6 ED [IF]
F FISH-EYE 17-28mm
F3.5-4.5
DA 16-45mm F4 ED AL
k
DA 16-50mm F2.8 ED AL
[IF] SDM
(As of April 2016)
Restrictions when using
the built-in flash
The built-in flash is not
available due to vignetting.
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.