Focal Length 55mmEquivalent to 35mm format 82.5mmMaximum aperture f/ 1.4Minimum aperture f/ 22Angle of View 28.6 degreesConstruction 9 elementa / 8 groupsFocusing Range 0.45m - infinityMagnification 0.173X MaxFilter size 58mmMount PENTAX K-AFWeight 375gDimensions (Length x Diameter) 66 x 70.5mmKit Content Front capRear capLenshoodSoft caseSpecial Features f/1.4 apertureCircular diaphramSDM technologyWeather sealed"Quick Shift" focusingOnly compattible with SDM enabled cameras