Pentax DA 12-24mm F4 Operating Guide

• 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 adjustment 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

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 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.

DA Lens_ENG.book  Page 6  Monday, January 3, 2011  11:45 AM