The Pentax-FA HD 43mm f1.9 sits as thestandard' within the HD PENTAX-FA Limited series. This focal length corresponds exactly to the diagonal of the image sensor of a 35mm full-frame camera - an exact replica of the human eye's natural angle of vision. It has a bright f/1.9 maximum aperture that copes well in low-light conditions, in turn, providing greater control of the depth of field. The nine-blade rounded diaphragm helps to produce a pleasing bokeh, whilst the PENTAX high-grade HD coating allows for increased light transmission. Impeccable image rendition and thorough ghosting/flare control provide an accurate, true-to-life colour balance. Alongside this, the PENTAX SP coating effectively repels dust, stains, and debris from the glass. In regard to imagery, the smooth and rich tonal gradation portrays the sense of three-dimensionality. It is a truly special lens, flying the flag for the stunning HD PENTAX-FA Limited series.