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Introduction:metal sleeve special for TMB planetary telescope eyepiecejust use this adapter with the original eyepiece, and you can get another focal length eyepiece. The 4mm is about 12mm, the 5mm is about 15mm, and the 6mm is about 18mm. Other focal lengths are also converted to about 3 times.Can be matched with domestic OEM TMB planetary eyepiecesUnscrew the original TMB eyepiece with a lens sleeve at the bottom, and then screw on the sleeve, you can get another focal length 
Material: aluminum alloySize: 1.25 inches (31.7mm)Thread: M28*0.6mm (suitable for connecting filters)Colour: BlackTested by Tatson, suitable for the following productsTMB 58 degrees 2.5mm, 3.2mm, 4mm, 4.5mm, 5mm, 6mm, 7mm, 7.5mm, 8mm, 9mm eyepieceCelestron 66 degrees 9mm, 6mm eyepieceDatyson 66 degrees 9mm, 6mm eyepiece 
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