Product Description: Brand: EYSDON Magnification: 5X Telscope Interface: 1.25 Inches Lens Coating: Multi-layer Coated Lens Material: Optical Glass(Single Concave Lens) Eyepiece Insertion Depth: 27mm Sleeve Material: Metal Photography T2 Thread: M42*0.75 Pitch Color: Black Package Include: 1 x Barlow Lens 2 x Dust Cover Pay Attention: The barlow lens role is not to improve image quality;but in order to comfort;Even a well made barlow will little damage on the imaging quality;When the barlow lens and eyepiece using together and the magnification is over the biggest magnification the barlow lens observation effect appears nearly zero or imaging becomes blurred;in order to reduce the influence of imaging;careful selection of barlow at different magnification. 5X BARLOW LENS This EYSDON 5x barlow lens could provide more magnification for your existing eyepieces to see the details of moon and bands of jupiter clearly. You could use the barlow lens with low power eyepiece;so as a result you will not only get a high power magnification, but also keep the exit hole on your eyepiece;keep a comfortable observation with wide view. 5X Magnification 5 times magnify of any 1.25'' eyepiece. this barlow lens effectively doubles the number of eyepieces in your collection. Bright And Clear View FMC broadband coating optical lens allows you look more closely and more detailed at the moon's surface and other planet clearly. Fully Metal Body With Camera T2 Thread Interface External Thread At The End-M42x0.75 Can use the camera T2 adapter to connect Cameras directly. (Ps:The T-ring in this Demo is not included in the package and need to be purchased separately) Metal sleeve material:High quality for a long term use.