EXPANSIVE VIEWS - Boasting an ultra-wide 85° apparent field of view, this 23mm eyepiece delivers immersive, panoramic observing sessions, enhancing your astronomical experiences. SUPERIOR CLARITY - Benefit from Pentax's renowned multi-layer coating, ensuring maximum light transmission, sharp images, and minimal glare for exceptional image clarity. COMFORTABLE VIEWING - Enjoy extended observations with a generous 20mm eye relief (12mm from rubber), designed for comfortable viewing even with eyeglasses, reducing eye strain. ROBUST DURABILITY - Crafted with JIS Class 4 equivalent splash-proof construction, this eyepiece is built to withstand light moisture, ensuring reliable performance in various conditions.