Male T-thread on its back that can attach DSLR camera and other T thread type accessories;it accepts 1.25" filters;just remove the optical glass part and add the filter on if need. The lens edges and inner barrel is blackened to provide maximum contrast;chromatic corrected;provide high transmittance;ensure clear and sharp images. The housing is precision machined from aluminum stock and black anodized to a hard finish. Barlow lens 2x double the capacity of an existing set eyepiece;give a big magnification boost to any 1.25" eyepiece it's used with. 1.25" 2x Barlow lens fully multi coated metal with M42x0.75 thread camera connect interface for telescope eyepieces.

Lens Coating Description: Fully Multi-Coated. Item Weight: 0.22 Pounds. Finderscope: Reflex. Focus Type: Manual Focus. Product Dimensions: 3.7"D x 1.96"W x 1.96"H. Eye Piece Lens Description: Barlow. Brand: SVBONY. Country of Origin: China. Manufacturer: SVBONY. Date First Available: October 7, 2015. Is Discontinued By Manufacturer: No. Best Sellers Rank: #13 in Telescope Barlow Lenses. Customer Reviews: 4.3 out of 5 stars 150 ratings 4.3 out of 5 stars. Item model number: FUSF9156A. : B0169QR8OE. Item Weight: 3.52 ounces. Product Dimensions: 3.7 x 1.95 x 1.95 inches.