When selecting a Barlow lens it is critical that you select one with a barrel size that will fit the eyepieces you are going to use it with. The barrel size is the diameter of the eyepiece tube that fits into the focuser. The standard eyepiece barrel size is 1-1/4 Inches.
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Specifications:
Kit content
Optical Hardware Standard 2x Barlow for 1.25"
User guide
For more information about, Optical Hardware Standard 3x Barlow for 1.25" website.
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