Ultra-Light and Slim: making it the lightest and thinnest lens, perfect for easy, on-the-go . Efficient Autofocus: Compact design with precise autofocus ensures quick and effortless without complex setup. Full-Frame Compatibility: Compact yet powerful, designed for a wide range of full-frame cameras. Why Is It Called "Chip":Small yet powerful piece of creativity.Effortlessly slipping into or taking out of your pocket.Ready to capture the world wherever your journey takes you.Effortless , no heavy gear Pocket - sized for any adventure! Built for Durability,Designed for Excellence HD Nano Coating: Reduces reflections and enhances image clarity. Waterproof & : Front lens coating protects against water, dust, and smudges. Aluminium Alloy Mount: Ensures durability and precision for long-term reliable performance. Stunning Image Quality: 2pcs ED Lenses: Minimize chromatic aberration for , vibrant images with accurate color reproduction. 2pcs Aspherical Lenses: Reduce distortion and maintain image clarity across the entire frame. 6pcs Elements in 6 Groups: Optimized design for consistent performance and compact size, perfect for travel and photo walks. Specification:B:for X-Mount Mount Color: Black Material: Aluminum Alloy Size:6.3x6.3x1.5cm Package Contents: 1 x AF 28mm F4.5 Lens Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.