9 elements in 6 groups, including a DSA lens that incorporates highly-accurate production technology; and an HR (High Refractive index) lens, that features high spherical aberration correction capability, are packed into a 35.5mm, 120g compact body. Boasts sharp, high-contrast image throughout the image area even at F1.8 aperture. State-of-the-art technology and know-how acquired through years of experience made it possible to achieve this level of image quality and high performance whilst ensuring a small size.