Pentax 21880 Operation Manual - Page 8

Features Of The Smc Pentax-da Lens

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6 FEATURES OF THE smc PENTAX-DA LENS • The smc PENTAX-DA lens is an interchangeable lens specifically designed for digital cameras. Its image circle is specialized for image sensors in PENTAX digital SLR cameras and its optical system is optimized for the characteristics of digital images. • When autofocusing is finished, it is possible to make fine adjustments by hand using the "Quick-Shift Focus System" (see page 19 for details). • Lenses that have "SDM" in their name are equipped with a supersonic motor. When mounted on a camera that supports supersonic motors, the autofocus is quiet and smooth. • The DA 55mm f/1.4 SDM uses a circular aperture. Using it when stopping down from full aperture to about f/2.8 keeps light sources and other fuzzy points perfectly round.

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6
FEATURES OF THE smc PENTAX-DA LENS
•
The smc PENTAX-DA lens is an interchangeable lens specifically designed for digital
cameras. Its image circle is specialized for image sensors in PENTAX digital SLR
cameras and its optical system is optimized for the characteristics of digital images.
•
When autofocusing is finished, it is possible to make fine adjustments by hand using the
“Quick-Shift Focus System” (see page 19 for details).
•
Lenses that have “SDM” in their name are equipped with a supersonic motor. When
mounted on a camera that supports supersonic motors, the autofocus is quiet and
smooth.
•
The DA
55mm f/1.4 SDM uses a circular aperture. Using it when stopping down from
full aperture to about f/2.8 keeps light sources and other fuzzy points perfectly round.