The focal length of the Planar T* 1,4/50 is equal to the perspective of the human eye. Its fast aperture and exceptional compactness are its outstanding features. This lens produces pleasing portrait style quality at the widest aperture and sharpens considerably beyond f/4 for any general purpose application. The famous symmetric lens design invented by Dr. Paul Rudolph at Carl Zeiss in 1896. The Planar lens is the most successful camera lens design – and, by the way, the most plagiarized – ever created. It provides the lens designer with numerous means to correct aberrations extraordinarily well. And its performance is very constant over a wide range of imaging ratios, enabling such a versatile lens variety as the Makro-Planar lens. The famous symmetric lens design invented by Dr. Paul Rudolph at Carl Zeiss in 1896. The Planar lens is the most successful camera lens design – and, by the way, the most plagiarized – ever created. It provides the lens designer with numerous means to correct aberrations extraordinarily well. And its performance is very constant over a wide range of imaging ratios, enabling such a versatile lens variety as the Makro-Planar lens.Photographers want to guide the observer through the image. Minimal depth of focus is often used as a design element. This keeps the background intentionally blurred to keep the attention of the observer on the main subject.