Pentax *ist IST DS - Manual (Page 181)

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Appe
ndix
Notes on [Using Aperture Ring]
Aperture Ring Use
When [Using aperture ring] is set to [2 (Permitted)] in [A Custom] menu
(p.101), the shutter can be released even if the aperture ring of the D FA,
FA, F or A lens is not set to the s position or a lens without a s position
is attached. However, the features will be restricted as shown in the table
below.
The camera operates in c (Aperture Priority) mode even if the mode dial is at
e
or b when the aperture is set to a value other than s.
Lens used Capture mode Restriction
D FA, FA, F, A, M (lens
only or with auto
diaphragm
accessories such as
auto extension tube K)
c (Aperture
Priority ) mode
The aperture remains open
regardless of the aperture ring
position. The shutter speed changes
in relation to the open aperture but an
exposure error may occur. In the
viewfinder, [F--] appears for the
aperture indicator.
D FA, FA, F, A, M, S
(with diaphragm
accessories such as
extension tube K)
c (Aperture
Priority) mode
Pictures can be taken with the
specified aperture value but an
exposure error may occur. In the
viewfinder, [F--] appears for the
aperture indicator.
Manual diaphragm
lens such as reflex
lens (lens only)
c (Aperture
Priority) mode
FA, F Soft 85mm FA
Soft 28mm (lens only) c (Aperture
Priority) mode
Pictures can be taken with the
specified aperture value in the manual
aperture range. In the viewfinder, [F--]
appears for the aperture indicator.
When depth of field is checked
(Preview), AE Metering is switched
on. Exposure check is possible.
All lenses
a (Manual)
mode
Pictures can be taken with the set
aperture value and shutter speed. In
the viewfinder, [F--] appears for the
aperture indicator. When depth of field
is checked (Preview), AE Metering is
switched on. Exposure check is
possible.