Lens performance

Conflicting elements exist in designing photo lenses, this fact would not be changed so far as any lens device is invited into camera even in digital age. Among the requirements, saturation, vignetting, contrast and resolution are indispensable element to establish good performance of optics. Of course the balance of them are important as that of other fields, the best answer for designing is calculated by means of sophisticated computer system in very short period of time even for eliminating harmful factors such as lens inner surface diffuse reflections. We may regard that the lens designing technology had been already established while the silver salt film formatting period of time. Also, a most patent for famous lens designing had been run short already, so every lens designing engineer looks for toward the same direction resulting some ideally good designing and almost the same as each other. Though some lens designing engineer might say that any lens taste called loudly is simply based on some residual correction error, I still insist on the "Taste". A choice of lens for photograph work resembles that of painting tools for drawing, so I think.