Improvement on lens design

Once camera manufacturers has been advocated to improve the sharpness and the resolution of the lens and the competition was fierce while Silver Salt Film period that was 40~50 years ago. As the researching and developing in the field proceeded, various method to correct aberration were improved brriantly, lens coating technology was eye opening sensation at all. Aspherical curvature of lens surface, Apo and Apo-Chromat technology were followed one by one, according to the improvement of computer system, Astronomical Mathematic Calculations were performed immediately, over a half century ago we did it handy hundled calculator taking few months. On the other hand, when Patent binding was released every engineer designed toward to the same direction then the results were almost the same and the they took the same pics as a matter of fact, manufacture's character disappeared. Though the researching and developing are continued by the engineer in every company, they endeavored to improve the picture quality especially at the corners. Well designed hi-performance lens and large image sensor with soft wear make it possible to produce fine picture like a Botanical drawn picture if checked closer. Then how about the resolution power of human eyes? Is it an indispensable requirement, Fine-tuned reproduction if the object is checked from a distance? Large size pic is observed from a distance? Sophisticated equipment does not always produce sophisticated work.