1. Bokeh is now a normal lens design parameter for very high quality lenses. 2. The third-order ( and lower ) Zernike polynomials correspond to the normal lens aberrations. 3. The cheapest portrait lenses are normal lenses ( 50mm ), used on a cropped sensor. 4. A normal lens that sees what the human eye see, is usually used for medium shots. 5. This Double-Gauss lens A 50 mm prime lens is the normal lens for the 135 film format. 6. Thus, you would need a normal lens to adjust all these different focused images into a single one. 7. The normal lens , because it often has a wide aperture, is often used for street and documentary photography. 8. What can you do with a normal lens when the athlete is 50 and 60 meters away ?" 9. The "'Panasonic Leica DG Summilux 25mm "'1.4 lens is a normal lens for Micro Four Thirds system cameras. 10. Adolf Hitler is seen through normal lenses and often from a low angle to appear tall in comparison.