The HD PENTAX-DA 70mm f/2.4 Limited Performance lens.This lens puts in an excellent performance as far as sharpness is concerned. At maximum aperture, sharpness in the centre of the frame is already very good, although the clarity recorded towards the edges of the frame is only fairly good at this aperture. Stopping down improves performance across the frame, with peak sharpness across the frame being achieved between f/5.6 and f/8. Here sharpness in the centre is outstanding, whilst clarity towards the edges of the frame is excellent here.
