Product Description: More magnification for the existing eyepieces to see more details of the moon and bands of Jupiter clearly;the EYSDON1.25 2x barlow lens is a better choice High quality and value barlow lens 2x gives a big magnification boost to any 1.25'' eyepiece;double the capacity of an existing set eyepieces at the cost of a single eyepiece Diameter:1.25/31.7mm Magnification factor:2x Lens material:pure optical glass lens Lens coating:FMC Sleeve material:Metal Thread interface:M42x0.75 pitch Length:2.9/7.5cm Weight:3.14oz/89g Package Include: 1 x Barlow Lens 2 x Dust Cap 1 x Camera T-Ring(Different models, appearance may be different, subject to the received goods) Note: Please make sure that the type of bayonet your camera uses before you buy it. If you don't know, you can tell us your camera model. 2X Magnification 2 times magnify of any 1.25'' eyepiece. this barlow lens effectively doubles the number of eyepieces in your collection. It's easy to use;simply insert the eyepiece of choice into the barlow lens then insert the barlow lens into the scope The barlow lens also could provide more magnification without reducing the exit hole on the eyepiece;it keeps a comfortable observation with wide view Main Points: Shortly height: 2.96 convenient to use and carry Free dust cover: Keeps lens clear easily with 2 pairs of dust cover 2x magnification factor with 1.25 interface: Doubles the magnification of any 1.25'' eyepiece Interface with M42x0.75 thread: With T/T2(M42x0.75mm) male thread for T/T2 connectors HD Fully Coated Lens Multilayer HD broadband green film optical glass lens: Chromatic corrected;provide high transmittance;ensure clear;sharp views. Offer a high quality observation without introducing additional chromatic aberration Quality aluminum stock and black anodized body: Precision machined;sturdy for a long term use The optics lens is made of two pieces of glass glued together