SVBONY SV137 2X Barlow Lens 1.25 inch Metal Body Bundle with SV135 Zoom Eyepiece for Astronomic Telescopes Visual

This 2x barlow lens with metal body, the lens fully multi-coated provide a sharp view; it can double the power of any 1.25” telescope eyepiece, ideal for high power observation; a brass compression ring can protect your eyepiece from marring or scratching the barrel.SVBONY SV135-This is definitely a must for beginners to start a good eyepiece collection.with this eyepiece, you can enjoy planetary astronomy without spending a lot of money.As a beginner;SV135 is great for starter astronomer! Zoom from low to high power in an instant with SV135 versatile eyepiece Zoom Eyepiece; 7mm-21mm linear continuous zoom;The field of view can be changed without changing the eyepiece;Very convenient for visual and outdoor use 1.25" barrel size; Compatible with any telescope that accepts 1.25" eyepieces.

• Provides comfortable viewing;Using the 2x barlow lens with a longer focal length eyepiece lets you achieve the same high magnification view; but in most cases the eye lens will be much larger; helping to reduce eye strain and improve comfort
• Quality aluminum stock and black anodized body; Precision machined;sturdy for a long term use
• Full bandwidth multi-coated lens;Ensure that the incoming light transmission rate is as high as 97% so that you can more easily see clear and bright images
• SV135 7 mm to 21mm adjustable focal length;SV135 7-21mm zoom eyepiece equivalent to multiple eyepieces ;obtain higher magnification with short focal length;It could bring you a better observation experience in a comfortable situation with high-contrast imaging
• 18mm - 16.3mm comfortable eye relief; especially for eyeglass wearers ;designed primarily for viewing landscapes and astronomical observations of lunar surfaces; planets; nebulae; clusters; and diffuse nebulae