More magnification for existing eyepieces to see the details of moon and bands of Jupiter clearly;the Barlow lens is a must,Quality and value high power SVBONY 5x Barlow lens to give a big magnification boost to any 1.25'' eyepiece.It will help double the capacity of an existing set eyepieces at the cost of a single eyepiece;It's super easy to use;you can simply insert eyepiece of choice into the Barlow lens;then insert it into the scope,Barlow lens could also provide more magnification without reducing the exit hole on the eyepiece. SVBONY SV135-This is definitely a must for beginners to start a good eyepiece collection.with this eyepiece, you can enjoy planetary astronomy .As a beginner; SV135 is good for starter astronomer! Zoom from low to high power in an instant with SV135 versatile eyepiece Zoom Eyepiece; 7mm-21mm linear continuous zoom; give you more flexibility with out changing eyepieces;Very easy to use and very smooth operation. 1.25" barrel size; Compatible with any telescope that accepts 1.25" eyepieces;1.25" aluminum barrel is threaded for filters and internally blackened to eliminate internal scattering