Dispersion is a common optical phenomenon, especially in lenses with a large aperture. The prime lens uses four groups of lenses to improve chromatic aberration and resolution performance, providing excellent image quality. The field of view at a focal length of 90 mm is approximately 27°. While the subject is close, the overwhelming compression of a large telephoto lens is avoided, creating a natural, unique atmosphere. This lens is ideal for portrait photography. The 90 mm lens has a maximum aperture of F1.25. This lens features a fixed focal length that cannot be changed. Prime lenses offer a high light intensity, allowing you to take good pictures even in less than optimal lighting conditions. They are particularly suitable when you want to capture specific and distinctive image compositions. Thanks to the large possible aperture, a shallower depth of field can be achieved. This allows you to optimally isolate subjects from the background with the targeted use of sharpness and blur. This lens can only be focused manually. Although manual focusing takes longer and is more challenging than working with autofocus, it offers several advantages: it allows you to precisely focus on the point you want, enabling shots that match your vision exactly. Even in situations where autofocus would struggle—such as in low light, on smooth surfaces with little texture, or in foggy weather—you will prefer to focus manually.