Pentax DA* 55mm lens

smc Pentax-DA* 55mm f/1.4 SDM
MakerPentax
Technical data
TypePrime
Focal length55mm
Focal length (35mm equiv.)82.5mm
Crop factor1.5
Aperture (max/min)f/1.4 / f/22
Close focus distance0.45 metres (18 in)
Max. magnification0.173x
Diaphragm blades9, rounded
Construction9 elements in 8 groups
Features
Manual focus overrideYes Yes
Ultrasonic motorYes Yes
Weather-sealingYes Yes
Unique featuresWeather-resistant
ApplicationPortrait
Physical
Max. length66.0 millimetres (2.60 in)
Diameter70.5 millimetres (2.78 in)
Weight375 grams (13.2 oz)
Filter diameter58mm
Accessories
Lens hoodPH-RBH 58mm
CaseS90-100
Angle of view
Diagonal28.6°
History
Introduction2008
Retail info
MSRP$799.95 USD

The smc Pentax-DA* 55mm f/1.4 SDM lens is a professional prime lens for the Pentax K-mount. It is designed for portrait use[1] with a 35mm equivalent focal length of 82.5mm. The lens features weather sealing, an SDM ultrasonic motor for quiet autofocus, and has 9 rounded diaphragm blades for smoother bokeh. Autofocus speed is similar to an equivalent screwdrive lens.[2]

References

  1. ^ http://www.dpreview.com/lensreviews/pentax_55_1p4_p15/ DPReview: Pentax smc DA* 55mm 1:1.4 SDM review
  2. ^ http://www.digitalcamerareview.com/default.asp?newsID=3916&review=pentax+da+55mm DigitalCameraReview: Pentax DA* 55mm f/1.4 SDM Lens Review
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