The Pentax AP WP series consists of two Porro prism sets of binoculars: the 8x30 and the 10x30. These are quite classic optical systems with a 2-piece achromatic objective lens and a 2+1 eyepiece. The producer claims that all air-to-glass surfaces are multi-coated by antireflection layers.
handy; shapely and solid casing; sensible transmission; very good colour rendering; sharp image almost to the very edge of the field of view; slight brightness loss on the edge of the field; good quality prisms made of BaK-4 glass; sensible coatings on all air-to-glass surfaces; properly darkened...
too high chromatic aberration; noticeable astigmatism; problems with distortion correction; slightly truncated exit pupils