The Leica lens is from all aspects a remarkable lens but ChatGPT-3.5 says it very well: "The Leica Noctilux lens is renowned for its exceptional low-light performance and its ability to create a unique and dreamy bokeh effect in photographs. One of the most interesting aspects of the Noctilux lens is its wide aperture, often around f/0.95, which allows it to gather an incredible amount of light. This wide aperture not only makes it excellent for shooting in low-light conditions but also provides photographers with the ability to achieve extremely shallow depth of field and beautiful background blur.

The Noctilux lens has gained a reputation among photographers for its ability to create a distinctive "glow" or softness around highlights, especially when used wide open. This characteristic adds a certain ethereal quality to images that many photographers find appealing, making it a favorite lens for artistic and creative photography.

However, this unique combination of characteristics also comes with challenges. The incredibly wide aperture and optical design require meticulous engineering and precision to control aberrations and maintain image quality. As a result, the Noctilux lens is often quite large and heavy compared to other lenses, and it comes with a premium price tag due to its craftsmanship and optical performance.

Overall, the Leica Noctilux lens is a remarkable piece of optical engineering that has become iconic for its distinctive rendering and artistic possibilities in photography".