If you are looking for quality-look here. This 2X Barlow has an achromatic multicoated ED (Extra low dispersion glass) lens. The same expensive glass used refractors to eliminate color fringing problems. You can unscrew the lens and screw it into your 2" eyepiece. This is a quality, multi-coated versatile Barlow in that the Barlow lens cell is removable from the base of the Barlow barrel. You can screw it onto the end of any 2" eyepiece that is threaded for 48mm telescope 2-inch filters. It comes with a 2" to 1.25" adapter, top plug, and bottom cap & screw-on bolt case. Has brass compression rings to protect your valuable eyepieces.

Features:

• 100% Brand New and High Quality
• This 2X Barlow has an achromatic multicoated ED (Extra low dispersion glass) lens
• This Barlow uses two-element, fully-multicoated lenses made from special ED (Extra-Low Dispersion) glass for excellent color correction and sharpness
• Item comes with a 2" to 1.25" adapter
• Has brass compression rings to protect your valuable eyepieces
• Threaded for use with 2" filters
• Increase the power of any 2" eyepiece by a factor of 2x

Specifications:

• Item Name: 2" ED 2x Barlow (w/ 2" to 1.25 " Adapter)
• Barrel Size: 2"/1.25"(50.8mm/31.7mm)
• Magnification Factor: 2x
• Coating: Fully coated
• Lens Material: Achromatic multicoated ED (Extra low dispersion glass) lens
• Net Weight: 11.56oz/327g
• Color: Ultra Black Design
• Total Height: 4.41inch/112mm

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• 1 x 2" ED 2x Barlow Lens