This bevel angle creates extreme sharpness but sacrifices durability. Superb sharpness, shadow details and contrast. In general, defocus reduces the sharpness and contrast of the image. A 10x50 binoculars is better than an 8x40 for magnification, sharpness and luminous flux. The Cooke lenses produced a certain texture, one that lacked the sharpness of Panavision lenses. Titanium coated blades offer a balance between durability, sharpness and anti-corrosion. This gives the cutting edge greater strength at the expense of sharpness. There is a tradeoff between stability and long term blade sharpness. Users report feelings of relaxation, sharpness, calmness, and alertness. This gives a somewhat rounded nose regardless of the sharpness ratio. Wootz swords were renowned for their sharpness and toughness. With too small a pinhole, however, the sharpness worsens, due to diffraction. Wanger felt that the film lost sharpness and detail. Some noise also increases acutance (apparent sharpness). This is because the Earth's atmosphere limits the sharpness of a star's image.