Please refer to the screen

Coating: Fully Multi-Coated (Total Length) Approx. 3.0 inches (75 mm) (Actual measurement). [Magnification] 2.5x [Lens] Apocromat 3 Element Airspaced [Sleeve Diameter] 1.25 inch (31.7 mm). The large lens with an effective diameter of 0.9 inch (23 mm) is very high performance and does not vignetrate even with long focus eyepieces. The lenses are also made of 3-bead apocromatic lenses, and the coating is made of very good quality Hooley multi-coat. AstroStreet Triplet 2.5x Apocromatic Barlow Lens 31.7mm Diameter.

Lens Coating Description: Fully Multi-Coated. Finderscope: Reflex. Objective Lens Diameter: 31.7 Millimeters. Eye Piece Lens Description: Barlow. Brand: ?. Manufacturer: ?. Date First Available: September 20, 2018. Is Discontinued By Manufacturer: No. Best Sellers Rank: #75 in Telescope Barlow Lenses. Customer Reviews: 3.9 out of 5 stars 49 ratings 3.9 out of 5 stars. Item model number: 462624. : B00JPXOVF8. Item Weight: 4.3 ounces. Package Dimensions: 5 x 2.76 x 2.2 inches.