TTArtisan 21mm F1.5 ULTRA WIDE ANGLE LARGE APERTURE Camera Lens Specifications:*Weight: 412g*Lens Material: Mental*Filter Size: 72mm*Closest Focus: 0.5m*Blades Numbers: 10pcs*Frame Type: Full-frame*Focal Length: 21mm*Aperture Range: F1.5-F16*Aperture Ring: Clicked Aperture* Focusing Method: Manual Focus Packing Listing:* 21mm F1.5 Full Frame Camera Lens; Camera Packing Box; Lens Cover; Lens Hood; User Manual;Lens Bag; Camera Body Cap&Rear Lens Cap; Camera Cap's Keeper More About 21mm F1.5: High Quality Lens::) TTArtisan 21mm F1.5 has 13 elements in 11 groups optical design, with 5 high refractive glasses,1 ASPH glass and multi-layer, which will increase the transmission of light, reduce the ghost and result to high quality images.:) 21mm F1.5 is weighing 430g , full metal-made body, which is durable and portable. Also, it’s easy and smooth to handle with. F1.5 Large Aperture::) The F1.5 large aperture allows more light transmission, which will reduce the noise and increase the image quality. You can shoot in Low Light, complex environment.:) It has a strong background blurring ability, shooting subject will be more highlighted.:) Ultra-wide Angle make your photos include more elements. Wide-used::) The lens can be used to shooting portraits, landscapes, architecture, starry sky and so on.:)Use the aperture well, your images will perform excellent. Customer Service::) If you have any questions, just ask for customer service !