2023/3/3 screw material has been changed to resin; AstroStreet 8x 2.0 inches (50 mm) 90° upright viewfinder (Simple instruction manual included with the photo is also included. ) | Equipped with an easy-to-use large 2.0 inch (50 mm) acromatic lens, and a complete upright image on the left and right side, making it very easy to see and install | The lenses are also fully multicoated so they are very bright and easy to use. Made in Taiwan | Aperture: 2.0 inches (50 mm) acromat; Field of View: 5.6 degrees; Eyepiece: Equipped with Amichi Prism that makes a completely upright image up and down | Vixen compatible XY type finder legs. *Please note that the viewfinder base is not included