1. Highly practical standard zoom lens with focal range A standard zoom lens that covers the image circle of a 35mm full-size image sensor and covers the wide-angle to medium-telephoto range with a focal length of 28 to 105mm. By using the latest optical design and a large number of high-performance lenses, various aberrations are corrected well and a sufficient amount of peripheral light is secured. It is possible to output ultra-high-definition images by fully demonstrating the capabilities of the Pentax 35mm full-size SLR camera. It is a compact and lightweight design that is convenient to carry and has high cost performance, making it suitable as a regular lens.