Pentax K20D manual 251, Aperture Ring Use, Exposure error may occur

Notes on [36. Using Aperture Ring] 251

Aperture Ring Use

When [36. Using aperture ring] is set to [Permitted] in [ACustom Setting] menu (p.75), 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 B, e, K, b or Lwhen the aperture is set to a value other than s.

Lens Used	Exposure Mode	Restriction
D FA, FA, F, A, M (lens		The aperture remains open
		regardless of the aperture ring
only or with auto	c (Aperture	position. The shutter speed
diaphragm accessories		changes in relation to the open
such as auto extension	Priority) mode	aperture but an exposure error may
tube K)		occur. In the viewfinder, [F--]
		appears for the aperture indicator.
D FA, FA, F, A, M, S (with	c (Aperture	Pictures can be taken with the
diaphragm accessories	Priority) mode	specified aperture value but an
such as extension tube K)
		exposure error may occur. In the
Manual diaphragm lens
	c (Aperture	viewfinder, [F--] appears for the
such as reflex lens (lens
		aperture indicator.
only)	Priority) mode
		Pictures can be taken with the
		specified aperture value in the
FA, F soft 85mm FA soft	c (Aperture	manual aperture range. In the
		viewfinder, [F--] appears for the
28mm (lens only)	Priority) mode	aperture indicator. When depth of
		field is checked (Optical Preview),
		AE Metering is switched on.
		Exposure check is possible.
		Pictures can be taken with the set
		aperture value and shutter speed.
All lenses	a (Hyper-	In the viewfinder, [F--] appears for
		the aperture indicator. When depth
	manual) mode
		of field is checked (Optical
		Preview), AE Metering is switched
		on. Exposure check is possible.

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Appendix