Pentax K20D Operating Manual page 252

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Lens names and mount names
DA lenses with an ultrasonic motor and FA zoom lenses with power zoom
use the K mount.
AF2
FA prime lenses (non-zoom lenses), DA lenses without ultrasonic motors
and D FA, FA J and F lenses use the K mount.
AF
See the lens manual for details.
Lenses and accessories that cannot be used with this camera
When aperture ring is set at other than the s (Auto) position or a lens
without an s position or accessories such as an auto extension tube or
auto bellows are used, camera does not operate unless [36. Using
aperture ring] (p.75) is set to [Permitted] in the [A Custom Setting] menu.
Refer to Notes on [36. Using Aperture Ring] (p.251) for restriction that
apply when [36. Using aperture ring] is set to [Permitted] in the [A Custom
Setting] menu.
All camera exposure modes are available when using DA/FA J or lenses
with an Aperture s position set to the s position.
Lens and Built-in Flash
The built-in flash cannot be regulated and fully fires when pre A lenses or
soft focus lenses are used.
Note that the built-in flash cannot be used as an Auto Flash.
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