A 5.5x super-telephoto zoom lens with a focal length of 55-300 mm
With a refractive index of 2.0 or higher, the use of a single HRI lens element provides the same benefits as multiple elements made of standard optical glass. In addition, as this single lens element also compensates for focal plane curvature and spherical aberration, the lens itself could be made smaller and lighter yet still offer 5.5x magnification and support for super-telephoto shooting at up to 300 mm. It exhibits excellent contrast and sharp rendering throughout the entire frame even at maximum aperture.
The benefits of vibration reduction are best demonstrated with super-telephoto shooting. This feature stabilises the view through the viewfinder for simpler focusing.