Teleconverter extender magnification 14 x suitable for camera type pentax for camera series pentax k suitable cameras pentax k 01 pentax k 3 pentax k 30 pentax k 5 pentax k 5 ii pentax k 50 pentax k 500 pentax k 5ii s pentax k 7 pentax k r lens mount pentax k area of use animal photography sports photography astrophotography outdoor functions dust resistant splash resistant coatings hd coating anti reflective coating length 20 mm colour black