SVBONY Barlow Lens 2X 1.25 Multi Coated Metal with M42x0.75 Thread Camera Connect Interface for Telescope 1.25" 2x Barlow lens fully multi coated metal with M42x0.75 thread camera connect interface for telescope eyepieces Barlow lens 2x double the capacity of an existing set eyepiece;give a big magnification boost to any 1.25" eyepiece The housing is precision machined from aluminum stock and black anodized to a hard finish The lens edges and inner barrel is blackened to provide maximum contrast;chromatic corrected;provide high transmittance;ensure clear and sharp images 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