Pentax ist - Manual (Page 21)

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*1. Lens with a maximum aperture of f/2.8 or larger (smaller aperture
number), and with its aperture ring set to the position.
*2. Lens with a maximum aperture of f/5.6 or larger (smaller aperture
number).
*3. To use an F/FA soft 85mm f/2.8 lens or FA soft 28mm f/2.8 lens, set
custom function number [CF17] to [2]. Pictures can be taken with the
aperture you set.
*4. Only the standard program mode works in the Auto picture mode.
✍
MEMO
K
AF2
and K
AF
mount lenses are designed to work with the
Autofocus SLR camera.
Lenses and accessories that cannot be used with this
camera
Only FA J lenses or lenses that have the position on the
aperture ring can be used. The camera does not operate under
the following conditions unless custom function number [CF17] is
changed to [2] (see pages 134 and 142):
• When a lens without an
position is used.
• When an F or FA lens is used and the aperture ring is set to a
position other than the position.
• When accessories such as an auto extension tube or auto
bellows are used.