
As an amateur I am satisfied with this Barlow lens. I've had my Celestron Omni AZ 102 telescope for a week now. Barlow showed up just in time for me to conjunct Jupiter and Venus with it. With the 10mm eyepiece that comes with the telescope I can see the rings of Venus and the moons of Jupiter, but this Barlow lens makes them much clearer. I've found that when I swap out a plain eyepiece, I need to refocus the telescope. I noticed that some reviewers have mentioned not having to refocus.

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