Pentax launches F4 Lens- 17-70 mm

pentax f4 17 70 sdm lens 3 4 Pentax launches F4 Lens 17 70 mm Pentax has last week only unveiled a new member in its 17-70 mm lens series and named it F4. This new lens from Pentax has been developed for their existing DSLR series of cameras and comes with two hybrid aspherical lens along with supersonic lens motor. The key feature of this lens is that it is coated with special material for preventing it from accidently water spill and dust. Other features includes constant aperture of f4 through the entire zoom range,Pentax’s Quick-shift Focus System.